How to solve the common problem of car brake drum?

How to solve the common problem of car brake drum?
Brake drum is an essential part of the car. Do you know how to solve the common problem of brake drum? The following is explained by xiangyuan auto parts co., ltd. in longyao county:
1. Fault phenomenon: brake pedal is pressed, the pedal does not rise, and there is no resistance;
Reason for judgment: check whether the brake fluid is missing; Whether there is oil leakage in the brake branch pump, pipeline and joint; Whether the parts of the main pump and the sub-pump are damaged;
2. Fault phenomenon: the brake pedal is pressed to the bottom, resulting in poor braking effect; Continuous braking, the effect is not improved, and the pedal gradually increased;
Reason: there is mixed gas in the braking system;
3. Fault phenomenon: continuously step on the brake, pedal back to increase, braking effect is improved;
Reason: the gap between friction disc and brake drum is too large;
4. Fault phenomenon: continuously step on the brake, the pedal position rises, and there is a sinking feeling;
Judge the cause: oil leakage;
5. Malfunction: low pedal position; Step again, position cannot rise, feel hair is hard;
Reason for judgment: the main pump is blocked;
6. Fault phenomenon: the pedal is normal in height, not soft or sinking, but the braking effect is not good;
Reason for judgment: excessive clearance between friction disc and brake drum or oil stains;
7. Fault phenomenon: braking deviation;
Reason for judgment: if the car is deflected to the left, it means that the right wheel is immobile, and vice versa;
8. Fault phenomenon: the car travels for a certain distance, and the brake drum (disc) gets hot;
Reason for judgment: check the brake master pump, brake branch pump or pipeline;
9. Fault phenomenon: the free stroke of the brake pedal is too small;
Reasons for judgment: to be adjusted;
10. Fault phenomenon: the braking fluid level rises slowly;
Judge the reason: loosen the air release screw and observe the return of the brake shoe. If the brake shoe is back, the oil pipe should be dredged; If the brake shoe does not return, the brake pump should be disassembled and inspected.