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The Braking failure condition of hydraulic brake
Brake failure
Confirmation of vacuum booster and a hydraulic transmission device is working properly, and then check the wheel brake. In the running state (30~50 km / h), depress the brake pedal with force, make the following judgments based on the phenomenon:
1) If the braking efficiency is poor, may be the following reasons: disc brake (drum) and friction wear, the brake drum, brake drum oil in water (Yu Tian), brake drum temperature is too high (disk mountain steep slopes), pin or rust rust and brake shoe eccentrically braced (vehicle put for a long time prone).
2).If the brake when the direction of deviation, should check the wheel brake friction plate abrasion is uniform, the brake clearance is appropriate, the proportional valve is effective.
3).After traveling 20 kilometers, with the hand brake drum or disc, was particularly hot, is the brake return device failure. Hydraulic brake pedal force is converted into hydraulic energy form to transfer the power, the transmission mechanism is simple, but the brake torque and brake pedal force into a linear relationship, if the tire and road adhesion enough car, the braking force and the pedal of a linear relation between the force. This function is called the brake pedal feeling (commonly known as foot), the driver can directly feel the various conditions of automobile brake device is normal or not, to rapid diagnosis. The fault of the hydraulic brake system are common: brake problems such as made brake bite. Brake problems
1.The phenomenon: the car, quickly pull the brake pedal to the floor, the car not slow down, stop immediately. The brake
To reduce the speed, the braking distance is too long.
2.Reason:
(1).Pedal free travel is too large.
(2).Lack of the brake master cylinder brake fluid, or compensation hole plugging, pump leather, leather ring aging, swell, deformation orStepped over.
(3).The brake master cylinder piston and cylinder wear excessive looseness leakage, poor sealing oil return valve, a valve spring break.
(4).The brake pump cup aging, swell, piston seizure, pump piston and cylinder wear excessively loose oil.
(5).The brake shoe wear, the brake clearance is too large or the gap adjustable anti.
(6).The brake drum circle loss, cutting or wear too thin, the surface of the brake shoe oil, ablation of hardening, rivet exposure.
(7).Into the air hydraulic brake system, brake lines or high temperature gasification, brake fluid in pipeline, the formation of air resistance.
(8).The tubing concavity, loose joints leakage, brake hose aging, broken or blocked.
3.Diagnosis and troubleshootingWhen the hydraulic brake system of the automobile braking is ineffective, the "three brake" (light foot, foot and even set foot on fast)
The elimination steps are as follows:1.The first foot brake pedal: light. The toe or foot before gently depress the brake pedal.
(1) If the pedal to the full 2/3 felt a braking resistance, the pedal free travel is too large, should be adjusted.
(2) When the front sole gently depress the brake pedal.
A).If the brake pedal is stepped down feeling than before even stepping the pedal hard, immovable, the brake master pump and pump cup swell, deformation that death or the brake fluid used for blocking the pipeline produces precipitation. Replace the brake fluid and braking leather cup, and clean the brake line.
B).If the brake pedal is stepped down to feel soft, and elastic, the hydraulic brake pipe with air or brake fluid by heat. We should tighten the pipe joints, according to different models, according to the requirements of deflation.
C).If the brake pedal is loosened after, the pedal can not return to the in situ, the brake master pump oil return valve of the oil return hole is blocked or. If this time associated with "Chi", "Puchi" sound, the brake master pump cup being stepped over. Should dredge pump oil return valve and oil return hole, re assembled or replaced general pump cup.
2.The second foot brake: quick step. Which foot fast brake pedal.
(1).Hydraulic braking system with fast self-locking connector if there is "light on" effective braking pedal, and depress the brake pedal brake is invalid, then that is the fast self-locking connector fitted or joint two spring force caused by improper adjustment. In this "quick step" when the brake pedal, joint bulb self-locking phenomenon, brake fluid cannot pass. Encounter this kind of situation, should be re assembled, and future oil end pressing spring appropriate reduction.
(2).If the "quick step", feel free to pedal travel is small, effective braking, and slowly the brake pedal is stepped down, feel more free travel, braking is invalid, the brake master pump cup aging, wear too much. Keep on the brake pedal pressure constant, if feel pedal continues to move down, the leakage brake lines. The first external check the brake pipe has no rupture, pipe joints have no loose, then check the total pump rod dustproof sleeve and wheel brake branch pump has no brake fluid leakage, if there is no brake fluid leakage, the total pump or pump cup aging rupture or trampled over, should be replaced.
3.The third, namely: even the foot brake continuously depress the brake pedal a few times.
(1)If the continuous step several times the brake pedal, pedal always exactly and no counter force, then the fault reason is the total pump the liquid storage chamber lack of brake fluid, oil inlet hole and a liquid storing chamber through the vent plug; deciduous or mechanical connection; or braking leather cup rupture or being stepped over. At this time, should be added to the liquid storage chamber brake fluid, clear the air vent, replacement of brake cup.
(2).If the continuous step several times the brake pedal, pedal can increase, improved and braking efficiency, it should be.
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Article tags: Electromagnetic Clutches And Brakes,Hydraulic Brake,Power Transmission.
