First, poor braking (brake soft). When the car is running, the brake deceleration is small and the braking distance is long. Usually due to:
    1. Pump or total pump oil, can not guarantee sufficient oil pressure;
    2. brake is faulty;
    3. Infiltrate the air into the brake pipe.
    Hydraulic brake system produces poor braking performance reasons, generally according to the brake pedal stroke, brake pedal when the soft and hard feeling, after the brake pedal to determine the stability. When the brake is maintained, the height of the pedal is slowed down, indicating that the brake pipe is broken, the joint is badly closed, the master cylinder or the pump piston is badly sealed, the oil return valve and the oil outlet valve are bad. Can first step off the brake pedal to observe the presence of brake fluid leakage. If the external normal, you should check the pump or master pump failure. Continuous pedal brake pedal height slightly increased, and a sense of elasticity, indicating that the brake pipe into the air.
    Second, the brake suddenly failed. The car is running, one foot or a few feet of brake, brake pedal are tread in the end, the brake suddenly failed. Cause: 1. The brake master cylinder or sub-pump oil spill serious; 2. Brake master cylinder or pump piston ring damage, or brake oil in the road too much air. In the event of this situation, the driver should quickly continuous feet
    Third, the brake deviation. Brake, the direction of deviation, in particular, did not install ABS brake anti-lock device car, the direction can not control, the reason for the uneven brake wear, the master cylinder a piston oil seal expansion, a sub-pump caused by oil spills.
    Four, brake jitter. Brake when the vibration, steering wheel bouncer. Reason for the brake disc swing limit, brake caliper deformation, brake pads grinding into a cone. Such a situation must be entered into the factory maintenance.
    Five, brake squeaky sound. Generally for the brake disc, brake pads or brake drum, shoe wear caused by uneven.
    Six, the brake does not return. When the brake pedal is depressed, it is felt that it is high, hard or free, and the car is difficult or difficult to drive. Symptom: step on the brake pedal, pedal does not rise, no resistance. Need to determine whether the brake fluid is missing; brake cylinder, pipe and joints at whether the oil spill; total pump, pump parts are damaged.