Fault phenomenon: when stepping on the brake pedal, the pedal does not rise and there is no resistance;
Judge the reason: check whether the brake fluid is missing; Whether the brake cylinder, pipeline and joint leak oil; Whether the master cylinder and sub-cylinder parts are damaged;
Fault phenomenon: the braking effect is not good when the brake pedal is stepped to the end; Continuous braking, the effect has not improved, and the pedal is gradually raised.
Cause: There is gas in the braking system.
Fault symptoms: continuous braking, high pedal, and improved braking effect.
Cause: The clearance between friction plate and brake drum is too large.
Fault symptoms: continuous braking, rising pedal position and sinking feeling.
Judge the cause: oil leakage.
Fault symptoms: the pedal position is very low; One more step, I feel hard if I can't get promoted.
Cause: The master cylinder is blocked.
Fault phenomenon: the pedal height is normal, and it does not sink without turning, but the braking effect is not good.
Cause: The gap between the friction plate and the brake drum is too large or there is oil pollution.
Fault phenomenon: braking deviation.
Reason: If the car leans to the left, it means that the right wheel brake is not in place, and vice versa.
Fault symptoms: mileage of vehicle driving section, and heating of brake drum (disc).
Reason: Check the master brake cylinder, slave brake cylinder or pipeline.
Symptoms: The free travel of the brake pedal is too small.
Reason for judgment: it needs to be adjusted.
Symptoms: Brake fluid level rises slowly.
Reason: Loosen the deflation screw and observe the return of the brake shoe. If the brake shoe returns, dredge the oil pipe; If the brake shoe does not return, remove and check the brake cylinder.