CN103318166B - Detection system for air content and water content in hydraulic ABS - Google Patents

Detection system for air content and water content in hydraulic ABS Download PDF

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Publication number
CN103318166B
CN103318166B CN201310288982.4A CN201310288982A CN103318166B CN 103318166 B CN103318166 B CN 103318166B CN 201310288982 A CN201310288982 A CN 201310288982A CN 103318166 B CN103318166 B CN 103318166B
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China
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detecting device
braking liquid
check valve
brake clamp
brake
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Expired - Fee Related
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CN201310288982.4A
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CN103318166A (en
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李孝禄
孙毕
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China Jiliang University
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China Jiliang University
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Abstract

A detection system for air content and water content in a hydraulic ABS comprises a brake caliper body, a brake caliper one-way valve, a brake caliper threaded hole, a detection device, a detection device one-way valve, a brake fluid water content sensor, a brake fluid oxygen content sensor and a brake fluid collector. The brake caliper threaded hole is formed in the brake caliper body, the brake caliper one-way valve is arranged on the brake caliper body and connected with the brake caliper threaded hole, one end of the detection device is connected with the brake caliper body through the brake caliper threaded hole, and the other end of the detection device is connected with the brake fluid collector. The brake fluid water content sensor is used for detecting brake fluid water content, the brake fluid oxygen content sensor is used for detecting brake fluid air content, and therefore whether brake fluid needs degassing can be determined. The detection system is simple in structure and convenient to use, achieves the purpose that the air content and the water content in the ABS brake fluid are detected simultaneously, in addition, degassing of the brake fluid can be achieved, the service life of the brake fluid is prolonged, and replacement safety of the brake fluid is improved.

Description

The checking system of air and aqueous ingredients in a kind of hydraulic ABS
Technical field
The present invention relates to automobile hydraulic ABS system, be specifically related to the checking system of air and aqueous ingredients in a kind of hydraulic ABS.
Background technology
Automobile ABS is a kind of important automobile active safety device, effectively can prevent wheel lockup, farthest ensure the driving safety of automobile when automobile brake, reduces the generation of traffic accident.ABS all installed by the automobile of more than 90% in the world at present.China has also put into effect the national standard that ABS is installed in mandatory provision.ABS generally comprises hydraulic ABS and air pressure ABS two kinds.Hydraulic ABS application is more extensive, and the brake-pressure of automobile hydraulic ABS is transmitted by brake piping inside brake liquid.During automobile brake, in brake piping, the performance of braking liquid is the biggest factor affecting abs braking performance and transient pressure.Therefore, when braking liquid performance changes, when particularly ABS internal system produces biphase gas and liquid flow, abs braking performance can be subject to certain impact.
The quality condition of the frequent degree that the amount of heat produced in Motor Vehicle Braking Procedure, ambient temperature, brake system use, the design type of brake system, braking system part, vehicle travel the situations such as road conditions, braking liquid water suction and brake system entrained air and will cause the generation of automobile ABS gas-liquid two-phase flow phenomenon, and brake piping inside can produce bubble.When automobile brake liquid temp is lower, if brake fluid temperature is lower than 100 DEG C, bubble main component is the air be mixed into; When automobile brake liquid temp is higher, if brake fluid temperature is higher than 100 DEG C, bubble main component is the composition being easy in air, aqueous vapor and the braking liquid be mixed into vaporize.
When producing biphase gas and liquid flow in ABS, the difference of gas content and void fraction, also different on the impact of the deceleration and stopping performance of ABS, ABS can be caused normally to brake when void fraction exceedes certain limit, serious harm traffic safety.
Therefore, maintenance company needs the replacement cycle in strict accordance with 2 years to remind car owner to change braking liquid in time, for the client that those will " be changed oil depending on feelings ", then needs to adopt on sound lines to differentiate braking liquid.Because braking liquid is not thatly use a kind of degree and just can visually see the liquid obviously worsened, can system of identification hydrodynamic continue to use, and traditional sentences method for distinguishing according to color, taste and feel, be inaccurate if adopted.Correct method is aqueous ingredients, boiling point and amount of air by detecting braking liquid, carries out qualitative or quantitative analysis to braking liquid.As long as the moisture be inhaled into reaches 2.5%, or when the amount of air be mixed into causes brake fluid resistance can meet the needs of ABS, just need to change braking liquid.Therefore detecting braking liquid aqueous ingredients, the boiling point of braking liquid and amount of air, is determine that braking liquid is the need of the comparison effective method changed.
3 kinds of methods are generally had to detect the aqueous ingredients of braking liquid or the boiling point of braking liquid:
1) for the braking liquid quick detection pen of qualitative analysis aqueous ingredients
Braking liquid quick detection pen there are 3 LED, are respectively green, yellow and red.Braking liquid quick detection pen sucks braking liquid, according to the display situation of its LED, just can judge the aqueous ingredients of braking liquid by fast qualitative.Green LED lamp is bright, and illustrate that braking liquid aqueous ingredients is lower, braking liquid is qualified; Yellow LED lamp is bright, illustrates that braking liquid aqueous ingredients is general, can continue to use, but within 6 months, need to detect once later again; Red LED lamp is bright, illustrates that braking liquid aqueous ingredients is higher, braking liquid nonconformity, must change.
2) for the braking liquid detector of quantitative analysis aqueous ingredients
If measure the aqueous ingredients of braking liquid, and provide technical materials to find out the boiling point of braking liquid according to this braking liquid maker, just can differentiate that braking liquid is the need of replacing.In actual applications, when braking liquid aqueous ingredients is lower than 0.5%, illustrate that braking liquid is normal; When braking liquid aqueous ingredients is 0.5% ~ 2.5%, illustrate that braking liquid is interchangeable and also can not change; When aqueous ingredients is greater than 2.5%, illustrate that braking liquid can not use, must change.
When using braking liquid detector to detect braking liquid aqueous ingredients, first wipe clean the outside face of detecting head, it be placed in dry air or insert new braking liquid completely.After debugging, just can measure.During measurement, detecting head is inserted completely in braking liquid to be measured, press red button switch always, after the several seconds, judge the state of braking liquid liquid according to relay indicating light.All green indicating lamps are bright, and represent that braking liquid is normal, aqueous ingredients is lower than 0.5%; Yellow indicator lamp is bright, then represent that braking liquid is bad, and moisture, higher than 0.5%, can be selected to change; Red Warning light is bright, and rings along with buzzer phone, then braking liquid critical deterioration is described, aqueous ingredients, higher than 2.5%, must be changed.
3) for testing the braking liquid safety detector of boiling point
The aqueous ingredients judging braking liquid by testing the boiling point of braking liquid for testing the braking liquid safety detector of boiling point.Inserted in braking liquid fluid reservoir by braking liquid safety detection instrument probe, connect with the mains and press switch, braking liquid will be heated to boiling point, and electronic thermometer accurately records the brake fluid temperature of heating and is presented on screen.Maintainer can judge the Brake Fluid Standard whether braking liquid meets automaker and specify, thus judges the quality of braking liquid quickly and easily.
Detect amount of air in braking liquid, also there is no good way in actual applications at present.Be generally navigating mate or maintainer when finding to brake partially soft, just need to exit to braking liquid.Method is as follows: brake system fluid reservoir is filled up braking liquid to most high liquid level (HLL) instruction place, one end of a transparent hose is connected with air bleed screw, the other end is placed in below the brake-fluid level in a transparent vessel, step on brake pedal for several times, and pedal be in step on position time, air bleed screw on wheel cylinder is unscrewed, after releasing mixed alveolate braking liquid, immediately air bleed screw is screwed.Repeatedly carry out aforesaid operations, until the liquid flowed out from wheel cylinder no longer containing till bubble.Finally tighten air bleed screw, load onto the dust cap of air bleed screw, add braking liquid to assigned position to fluid reservoir, build fluid reservoir.
Because content of oxygen in air is certain, be mixed into oxygen content in braking liquid by detection and just can know the content being mixed into air in braking liquid.If oxygen content is greater than the oxygen content value of setting in the braking liquid detected, the carrier of oxygen volume concentrations content value as setting is 0.2%, then braking liquid hollow gas volume concentrations content is about 1%.
Time current automobile maintenance industry is tested to braking liquid, braking liquid aqueous ingredients and amount of air can not be detected simultaneously, to the understanding of air content in braking liquid, can only be judged by the method for this subjectivity of braking, also dangerous to braking liquid venting inconvenience.
Summary of the invention
The present invention seeks to: by the use of the checking system of air in hydraulic ABS and aqueous ingredients, braking liquid aqueous ingredients and air content in hydraulic ABS are detected simultaneously, improve braking liquid useful life, improve safety.
Major technique of the present invention is:
The present invention includes brake clamp caliper, brake wheel cylinder, piston, brake clamp check valve, brake clamp tapped bore, sealing bolt, sealing bolt metallic gasket, detecting device and braking liquid catcher, piston is positioned at brake clamp caliper, and brake wheel cylinder is between brake clamp caliper and piston.
Brake clamp caliper has brake clamp tapped bore, brake clamp check valve is arranged on brake clamp caliper, brake clamp check valve one end communicates with brake wheel cylinder, the brake clamp check valve other end is connected with brake clamp tapped bore, brake clamp check valve comprises the unidirectional valve pocket of brake clamp, brake clamp check valve spring, brake clamp check valve needle-valve body and brake clamp check valve needle-valve body through hole, brake clamp check valve spring and brake clamp check valve needle-valve body are positioned at the unidirectional valve pocket of brake clamp, and brake clamp check valve needle-valve body through hole is positioned at brake clamp check valve needle-valve body.
When in hydraulic ABS, the checking system of air and aqueous ingredients uses, detecting device one end is connected with brake clamp caliper by brake clamp tapped bore, and the detecting device other end is connected with braking liquid catcher, detecting device comprises detecting device bolt, detecting device seal ring, detecting device bolt hole, detecting device body, detecting device measures chamber, detecting device check valve, braking liquid water content sensor, braking liquid oxygen content sensor and acquisition and display unit, be connected by detecting device seal ring between detecting device and brake clamp caliper, detecting device bolt is positioned at brake clamp tapped bore, detecting device bolt hole is had in the middle of detecting device bolt, be provided with detecting device in detecting device body and measure chamber, detecting device is measured one end, chamber and is communicated with detecting device bolt hole, detecting device is measured the chamber other end and is connected with detecting device check valve, detecting device check valve comprises detecting device check valve needle-valve body, the unidirectional valve pocket of detecting device and detecting device check valve spring, and detecting device check valve needle-valve body and detecting device check valve spring are positioned at the unidirectional valve pocket of detecting device, braking liquid water content sensor is arranged on detecting device body, braking liquid water content sensor one end and detecting device are measured chamber and are connected, the braking liquid water content sensor other end is connected with acquisition and display unit, and braking liquid water content sensor is also connected with braking liquid water content sensor power supply, braking liquid oxygen content sensor is arranged on detecting device body, braking liquid oxygen content sensor one end and detecting device are measured chamber and are connected, the braking liquid oxygen content sensor other end is connected with acquisition and display unit, and braking liquid oxygen content sensor is also connected with braking liquid oxygen content probe power.
Braking liquid catcher comprises braking liquid collector chamber, braking liquid catcher body and braking liquid catcher check valve, braking liquid collector chamber and braking liquid catcher check valve are positioned at braking liquid catcher body, braking liquid collector chamber is connected with braking liquid catcher check valve, and braking liquid catcher check valve comprises braking liquid catcher check valve steel ball and braking liquid catcher check valve spring.
When in hydraulic ABS, the checking system of air and aqueous ingredients does not use, sealing bolt is connected with brake clamp caliper by brake clamp tapped bore, has sealing bolt metallic gasket between sealing bolt and brake clamp caliper.
The present invention compared with prior art tool has the following advantages: system of the present invention can detect aqueous ingredients in hydraulic ABS, judge that braking liquid is the need of replacing, air content in hydraulic ABS can also be detected, if braking liquid air content is too high, the present invention can exit to braking liquid.Structure of the present invention is simple, solves the problem that in hydraulic ABS, braking liquid aqueous ingredients and amount of air detect simultaneously, improves braking liquid useful life, improves the safety changing braking liquid.
Accompanying drawing explanation
Structural representation when Fig. 1 is the checking system use of air and aqueous ingredients in a kind of hydraulic ABS of the present invention;
Fig. 2 is the structural representation of the checking system of air and aqueous ingredients in a kind of hydraulic ABS of the present invention when not using;
Fig. 3 is the workflow diagram of the checking system of air and aqueous ingredients in a kind of hydraulic ABS of the present invention.
1: brake clamp caliper; 2: brake wheel cylinder; 3: piston; 4: brake clamp check valve; 401: the unidirectional valve pocket of brake clamp; 402 brake clamp check valve springs; 403: brake clamp check valve needle-valve body; 404: brake clamp check valve needle-valve body through hole; 5: brake clamp tapped bore; 6: sealing bolt; 7: sealing bolt metallic gasket; 8: detecting device; 801: detecting device bolt; 802: detecting device seal ring; 803: detecting device bolt hole; 804: detecting device body; 805: detecting device measures chamber; 806: detecting device check valve; 806a: detecting device check valve needle-valve body; 806b: the unidirectional valve pocket of detecting device; 806c: detecting device check valve spring; 807: braking liquid water content sensor; 807a: braking liquid water content sensor power supply; 808: braking liquid oxygen content sensor; 808a: braking liquid oxygen content probe power; 809: acquisition and display unit; 9: braking liquid catcher; 901: braking liquid collector chamber; 902: braking liquid catcher body; 903: braking liquid catcher check valve; 903a: braking liquid catcher check valve steel ball; 903b: braking liquid catcher check valve spring.
Detailed description of the invention
Below in conjunction with accompanying drawing, further illustrate the present invention by embodiment.But this embodiment is only illustrative, the protection domain of the invention is not by the restriction of this embodiment.
As shown in Figure 1, composition graphs 2, in a kind of hydraulic ABS of the present invention, the checking system of air and aqueous ingredients comprises brake clamp caliper 1, brake wheel cylinder 2, piston 3, brake clamp check valve 4, brake clamp tapped bore 5, sealing bolt 6, sealing bolt metallic gasket 7, detecting device 8 and braking liquid catcher 9, piston 3 is positioned at brake clamp caliper 1, and brake wheel cylinder 2 is between brake clamp caliper 1 and piston 3.
Brake clamp caliper 1 has brake clamp tapped bore 5, brake clamp check valve 4 is arranged on brake clamp caliper 1, brake clamp check valve 4 one end communicates with brake wheel cylinder 2, brake clamp check valve 4 other end is connected with brake clamp tapped bore 5, brake clamp check valve 4 comprises the unidirectional valve pocket 401 of brake clamp, brake clamp check valve spring 402, brake clamp check valve needle-valve body 403 and brake clamp check valve needle-valve body through hole 404, brake clamp check valve spring 402 and brake clamp check valve needle-valve body 403 are positioned at the unidirectional valve pocket 401 of brake clamp, brake clamp check valve needle-valve body through hole 404 is positioned at brake clamp check valve needle-valve body 403.
As shown in Figure 1, when in described a kind of hydraulic ABS, the checking system of air and aqueous ingredients uses, detecting device 8 one end is connected with brake clamp caliper 1 by brake clamp tapped bore 5, and detecting device 8 other end is connected with braking liquid catcher 9, detecting device 8 comprises detecting device bolt 801, detecting device seal ring 802, detecting device bolt hole 803, detecting device body 804, detecting device measures chamber 805, detecting device check valve 806, braking liquid water content sensor 807, braking liquid oxygen content sensor 808 and acquisition and display unit 809, be connected by detecting device seal ring 802 between detecting device 8 and brake clamp caliper 1, detecting device bolt 801 is positioned at brake clamp tapped bore 5, detecting device bolt hole 803 is had in the middle of detecting device bolt 801, be provided with detecting device in detecting device body 804 and measure chamber 805, detecting device is measured one end, chamber 805 and is communicated with detecting device bolt hole 803, detecting device is measured chamber 805 other end and is connected with detecting device check valve 806, detecting device check valve 806 comprises detecting device check valve needle-valve body 806a, the unidirectional valve pocket 806b of detecting device and detecting device check valve spring 806c, detecting device check valve needle-valve body 806a and detecting device check valve spring 806c are positioned at the unidirectional valve pocket 806b of detecting device, braking liquid water content sensor 807 is arranged on detecting device body 804, braking liquid water content sensor 807 one end and detecting device are measured chamber 805 and are connected, braking liquid water content sensor 807 other end is connected with acquisition and display unit 809, and braking liquid water content sensor 807 is also connected with braking liquid water content sensor power supply 807a, braking liquid oxygen content sensor 808 is arranged on detecting device body 804, braking liquid oxygen content sensor 808 one end is measured chamber 805 with detecting device and is connected, braking liquid oxygen content sensor 808 other end is connected with acquisition and display unit 809, and braking liquid oxygen content sensor 808 is also connected with braking liquid oxygen content probe power 808a.
Braking liquid catcher 9 comprises braking liquid collector chamber 901, braking liquid catcher body 902 and braking liquid catcher check valve 903, braking liquid collector chamber 901 and braking liquid catcher check valve 903 are positioned at braking liquid catcher body 902, braking liquid collector chamber 901 is connected with braking liquid catcher check valve 903, and braking liquid catcher check valve 903 comprises braking liquid catcher check valve steel ball 903a and braking liquid catcher check valve spring 903b.
As shown in Figure 2, when in described a kind of hydraulic ABS, the checking system of air and aqueous ingredients does not use, sealing bolt 6 is connected with brake clamp caliper 1 by brake clamp tapped bore 5, has sealing bolt metallic gasket 7 between sealing bolt 6 and brake clamp caliper 1.
As shown in Figure 3, the workflow diagram of the checking system of air and aqueous ingredients in described a kind of hydraulic ABS, comprises the following steps:
1), start automobile, step on brake pedal, ABS starts working;
2), sealing bolt 6 is pulled down from brake clamp caliper 1;
3), detecting device bolt 801 is screwed into brake clamp tapped bore 5, but detecting device bolt 801 does not back down brake clamp check valve 4, detecting device 8 connects with braking liquid catcher 9, and braking liquid water content sensor 807 and braking liquid oxygen content sensor 808 access acquisition and display unit 809;
4), tighten detecting device bolt 801, detecting device bolt 801 is made to back down brake clamp check valve 4, braking liquid is successively by brake wheel cylinder 2, the unidirectional valve pocket 401 of brake clamp, brake clamp check valve needle-valve body through hole 404, detecting device bolt hole 803 and detecting device measure chamber 805, the response pressure of detecting device check valve 806 is greater than owing to flowing into the detecting device brake fluid pressure measured in chamber 805, the braking liquid flowed in detecting device measurement chamber 805 backs down detecting device check valve 806, braking liquid flows into the unidirectional valve pocket 806b of detecting device, braking liquid starts to enter braking liquid catcher 9,
5), by braking liquid water content sensor 807 detect braking liquid aqueous ingredients, if the braking liquid aqueous ingredients (volume concentration) detected is greater than 2.5%, change braking liquid; When braking liquid aqueous ingredients is 0.5% ~ 2.5%, illustrate that braking liquid is interchangeable and also can not change; When braking liquid aqueous ingredients is lower than 0.5%, illustrate that braking liquid is normal, do not need to change;
6), braking liquid oxygen content sensor 808 detects oxygen content in braking liquid, because content of oxygen in air is certain, is mixed into oxygen content in braking liquid and just can knows by detecting the content being mixed into air in braking liquid.If oxygen content is greater than the oxygen content value of setting in the braking liquid detected, the carrier of oxygen volume concentrations content value of setting is 0.2%, then braking liquid hollow gas volume concentrations content is about 1%.If oxygen content is greater than 0.2% in the braking liquid detected, illustrate that in braking liquid, air content is higher.Continue to detect oxygen content in braking liquid, then make braking liquid continue to flow into braking liquid catcher 9 simultaneously, realize exitting to the air in braking liquid;
7), when braking liquid oxygen content sensor 808 detects the oxygen content value 0.2% that oxygen content in braking liquid is less than setting, illustrate that in braking liquid, air content meets braking liquid operating needs, stop detecting, unclamp detecting device bolt 801, under brake clamp check valve spring 402 resilient force, brake clamp check valve 4 is closed, and braking liquid stops flowing in detecting device 8;
8), loosen the brake, automobile flameout, pulls down detecting device 8, tightens sealing bolt 6.

Claims (1)

1. the checking system of air and aqueous ingredients in a hydraulic ABS, comprise brake clamp caliper (1), brake wheel cylinder (2), piston (3), brake clamp check valve (4), brake clamp tapped bore (5), sealing bolt (6), sealing bolt metallic gasket (7), detecting device (8) and braking liquid catcher (9), described piston (3) is positioned at described brake clamp caliper (1), described brake wheel cylinder (2) is positioned between described brake clamp caliper (1) and described piston (3), it is characterized in that:
Described brake clamp caliper (1) has described brake clamp tapped bore (5), described brake clamp check valve (4) is arranged on described brake clamp caliper (1), described brake clamp check valve (4) one end communicates with described brake wheel cylinder (2), described brake clamp check valve (4) other end is connected with described brake clamp tapped bore (5), described brake clamp check valve (4) comprises the unidirectional valve pocket of brake clamp (401), brake clamp check valve spring (402), brake clamp check valve needle-valve body (403) and brake clamp check valve needle-valve body through hole (404), described brake clamp check valve spring (402) and described brake clamp check valve needle-valve body (403) are positioned at the unidirectional valve pocket of described brake clamp (401), described brake clamp check valve needle-valve body through hole (404) is positioned at described brake clamp check valve needle-valve body (403),
When in described a kind of hydraulic ABS, the checking system of air and aqueous ingredients uses, described detecting device (8) one end is connected with described brake clamp caliper (1) by described brake clamp tapped bore (5), and described detecting device (8) other end is connected with described braking liquid catcher (9), described detecting device (8) comprises detecting device bolt (801), detecting device seal ring (802), detecting device bolt hole (803), detecting device body (804), detecting device measures chamber (805), detecting device check valve (806), braking liquid water content sensor (807), braking liquid oxygen content sensor (808) and acquisition and display unit (809), be connected by described detecting device seal ring (802) between described detecting device (8) and described brake clamp caliper (1), described detecting device bolt (801) is positioned at described brake clamp tapped bore (5), described detecting device bolt hole (803) is had in the middle of described detecting device bolt (801), be provided with described detecting device in described detecting device body (804) and measure chamber (805), described detecting device is measured chamber (805) one end and is communicated with described detecting device bolt hole (803), described detecting device is measured chamber (805) other end and is connected with described detecting device check valve (806), described detecting device check valve (806) comprises detecting device check valve needle-valve body (806a), the unidirectional valve pocket of detecting device (806b) and detecting device check valve spring (806c), and described detecting device check valve needle-valve body (806a) and described detecting device check valve spring (806c) are positioned at the unidirectional valve pocket of described detecting device (806b), described braking liquid water content sensor (807) is arranged on described detecting device body (804), described braking liquid water content sensor (807) one end is measured chamber (805) with described detecting device and is connected, described braking liquid water content sensor (807) other end is connected with described acquisition and display unit (809), and described braking liquid water content sensor (807) is also connected with braking liquid water content sensor power supply (807a), described braking liquid oxygen content sensor (808) is arranged on described detecting device body (804), described braking liquid oxygen content sensor (808) one end is measured chamber (805) with described detecting device and is connected, described braking liquid oxygen content sensor (808) other end is connected with described acquisition and display unit (809), and described braking liquid oxygen content sensor (808) is also connected with braking liquid oxygen content probe power (808a), described braking liquid catcher (9) comprises braking liquid collector chamber (901), braking liquid catcher body (902) and braking liquid catcher check valve (903), described braking liquid collector chamber (901) and described braking liquid catcher check valve (903) are positioned at described braking liquid catcher body (902), described braking liquid collector chamber (901) is connected with described braking liquid catcher check valve (903), described braking liquid catcher check valve (903) comprises braking liquid catcher check valve steel ball (903a) and braking liquid catcher check valve spring (903b),
When in described a kind of hydraulic ABS, the checking system of air and aqueous ingredients does not use, described sealing bolt (6) is connected with described brake clamp caliper (1) by described brake clamp tapped bore (5), has described sealing bolt metallic gasket (7) between described sealing bolt (6) and described brake clamp caliper (1).
CN201310288982.4A 2013-07-08 2013-07-08 Detection system for air content and water content in hydraulic ABS Expired - Fee Related CN103318166B (en)

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DE102019208398A1 (en) * 2019-06-07 2020-12-10 Robert Bosch Gmbh Method for testing an electro-hydraulic power vehicle brake system for an autonomously driving land vehicle for air in the brake fluid
CN111645660A (en) * 2019-11-14 2020-09-11 摩登汽车有限公司 Automobile brake oil can warning device and automobile

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