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When the brake pedal travel is too large, the braking time will be slow, the braking effect will decrease, the braking distance will increase, and the braking function will be completely lost. There are 4 main reasons for this failure: 1. brake oil pressure is insufficient. (brake main cylinder oil shortage, brake pipeline rupture, tubing joint leakage, oil road blockage) 2. brake system with air 3. brake pedal free travel or brake clearance is too large, brake shoe friction disc contact bad, serious wear or oil pollution 4. brake main cylinder, cylinder piston and cylinder wear or pull injury, skin bowl aging damage exclusion rule out This failure can refer to the following maintenance methods: 1. continuously step down the brake pedal, such as the pedal gradually increased and have a flexible feeling, but after a little stop a little after stepping on the pedal is still very low, that is, there is air in the brake system, at this time the brake system should be discharged. 2. the one foot brake is not effective, but the braking effect is very good when continuously pedals several times. Generally, the brake pedal has too large free travel or too long brake clearance. The pedal free travel should be adjusted, then the brake clearance should be checked, and the brake should be disassembled and repaired if necessary. When the brake pedal is 3., the brake pedal is not weak, but the brake effect is bad. This phenomenon is the wheel brake failure, such as the brake shoe oil or bad contact, the aging of the friction plate, the wear and the wear of the brake drum. Check the braking technology status and adjust and repair if necessary.