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When the brake is maintained, if the height of the pedal slowly decreases, it indicates that there is a crack somewhere in the brake pipe, poor joint sealing, poor seal of the main pump or cylinder pump, and defective return valve and oil valve. The brake pedal can be depressed first to observe the presence of brake fluid leakage. If the outside is normal, check the sub-pump or master pump for failure. The height of the pedal is slightly increased and there is a sense of elasticity when the brakes are continuously braked. This indicates that air has penetrated into the brake pipe.
Second, the brake suddenly fails. When the car is moving, one or more feet are braked. The brake pedal is stepped to the end and the brake suddenly fails. Causes: 1. Severe oil leakage from the master cylinder or cylinder; 2. Damaged piston seal of the master cylinder or cylinder, or excessive air in the brake fluid. If this happens, the driver should quickly brake on both feet. In the event of failure of the brake, it should be stopped immediately. First, observe whether there is any loss of brake fluid in the brake fluid tank, and then observe whether the brake master cylinder, sub cylinder pump, and fuel pipeline have any leakage brake fluid.
Third, the brake deviation. When braking, the direction of deviation, especially in cars without ABS brake anti-lock device, the direction can not control, the reason is uneven wear and tear of the brakes, the master pump a piston seal expansion, a sub-pump leak caused.
Fourth, brake jitter. Shivering on the brakes, the steering wheel bomber. The reason is that the brake disc swings beyond the limit, the brake caliper is deformed, and the brake pads are tapered. If this happens, it must be repaired.
Fifth, the brakes rang. Generally caused by uneven wear of brake discs, brake pads or brake drums and shoes.
Six, the brakes do not return. When the brake pedal is depressed, it feels high and hard or there is no free journey, and the car is difficult to start or hard to drive. Fault phenomenon: Step on the brake pedal, the pedal will not rise, no resistance. It is necessary to judge whether the brake fluid is missing, whether there is oil leakage in the brake cylinder, pipeline and joints, and whether the main pump and the pump components are damaged.
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Analysis of Common Faults and Causes of Braking System
One, bad braking effect (brake is soft). When the car is braking during braking, the braking deceleration is small and the braking distance is long. Usually it is due to: 1. The pump or the main pump seepage can not guarantee enough oil pressure; 2. The brake is faulty; 3. The air in the brake pipe is infiltrated. The reason why the hydraulic brake system has a poor braking performance can be generally judged based on the brake pedal stroke, the soft and hard feeling when the brake pedal is depressed, and the stability after depressing the brake pedal.