1. Fault phenomenon
The brake pedal travel is too large, the braking action is slow, the braking effect is very low or even lost, and the braking distance increases.
2. Cause of failure
1) Insufficient brake oil pressure.
2) There is air in the brake system
3) The free travel of the brake pedal or the brake clearance is too large, the brake shoe friction pads are in poor contact, severely worn or oily
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4) The brake master cylinder, wheel cylinder piston and cylinder tube are worn or strained, and the leather cup is aged and damaged
3. Fault judgment and elimination
1) Depress the brake pedal continuously, if the pedal gradually rises and has an elastic feeling, but it is still very low when the pedal is stepped on after a short pause, that is, there is air in the braking system, and the response should be The brake system is exhausted
2) The braking with one foot does not work, but the braking effect is very good when the pedal is pressed several times in a row. Generally, the free travel of the brake pedal is too large or the braking gap is too large. . The free stroke of the pedal should be adjusted, and then the brake clearance should be checked, and if necessary, the brake should be disassembled and repaired.
3) When the brake pedal is pressed, it is not weak or heavy, but the braking effect is poor, which is the phenomenon of the wheel. Brake failure, such as oil or poor contact of the brake shoes, aging, wear of the friction plate, uneven wear of the brake drum. The technical condition of the brakes should be checked, adjusted and repaired if necessary.