First, the brake failure: continuous depressing the brake pedal, the vehicle does not slow down. If you pedal the brake pedal continuously, the pedal does not rise and feels no resistance, check the following items.
1, brake liquid tank brake fluid is a serious lack of the brake cylinder and joints at whether there is brake fluid missing imprint.
2, if no oil, check the brake mechanical coupling parts are out of fault.
Second, the brake is not working: driving brake, one foot brake is not working, even step on a few steps, the brake effect is not good. Distinguish the following phenomena to be diagnosed.
1, the first step on the brake pedal to the end, the brake effect is not good, continuous pedal, pedal gradually increased, but the feeling is very soft, the braking effect is not good. Judge the brake system mixed with air. Should be checked to leak out to be excluded.
2, one foot is not working, continuous 2-3 feet brake, pedal position increased, the brake effect is improved, the pedal free running too large or friction plate and brake drum gap is too large, adjust or be replaced.
3, continuous pedal down, pedal position can be increased, continue to step on, there is sinking feeling, then the case of oil spills.
4, depress the brake pedal, the pedal position is very low, and then continuous step, pedal position can not rise, feel stiff. It is the total pump compensation is also blocked, should be cleared to clear.
5, pedal height normal, not soft does not sink, but the braking effect is not good, compared to brake drum (disk), friction plate serious wear or stained with oil, should be promptly removed repair or replacement.
Third, the brake deviation: brake, the vehicle to the side of the skew.
1, the car when the left side of the brake skew, then the right wheel brake is not working, and vice versa.
2, check the brake is not a round of the brake Technical conditions: clearance, wear, seepage, leakage and other specific failures into a smooth, out of repair or replacement.
3, check the brake does not work tire pressure and pattern wear.
Fourth, the brake drag: lift the brake pedal, all or individual wheels are still in a braking state, start the vehicle again because of difficulties.
1, the vehicle driving a mileage, the hand touch the brake drum (disk), if the fever, the fault in the brake master cylinder. If individual brakes encourage (disc) heat, the fault occurs on the brakes.
2, the free travel is too small, (some cars do not pedal free travel, only the work of the trip), or with a hook from the pedal, you have to adjust the free travel (work trip), or replace the return spring.
3, observe the brake cylinder, repeatedly step on the brake pedal, the cylinder liquid brake liquid surface recovery slowly slow, you have to dismantle the total pump or replace the master pump (some cars are not allowed to dismantle).
4, such as failure in individual wheel brakes. Loosen the bleed screw, such as the brake fluid spray, brake shoe back, then tubing blocked, should be clear. If the brake plate is still not returned, it should disassemble the brake cylinder, piston, rubber oil seal, caliper, return spring technical performance, fault pieces replacement.http://zybcbrake.com