1. Brake does not return: When the brake pedal is pressed, the pedal cannot return or the return speed is slow. This is usually caused by dirt on the cylinder piston, which needs to be treated to ensure that the air inside the brake pipes and brake oil is completely drained.
2. Brake becoming soft: There are various reasons for brake becoming soft, including insufficient brake oil, wear on brake discs and pads, air in brake pipes, and deterioration of brake oil. Among them, brake oil deterioration and lack of brake oil are the most common reasons.
3. Abnormal noise during braking: Abnormal noise during braking may be caused by thinning of brake pads, poor quality of brake pads, presence of foreign objects in brake pads, or rusting of brake discs. In general, stepping on the brake a few more times can alleviate the abnormal noise.
4. Brake failure: Brake failure is a serious problem that is generally related to the quality of the car. If there is a brake failure, the first step is to control the vehicle speed, gradually downshift and fully utilize the engine braking to reduce the speed. When the speed is below 60km/h, consider using the handbrake to slow down (accidents can occur if the speed is too high).
5. Spring feet: There are two types of spring feet. One is to feel the pedal bouncing when pressing the brake hard, which is a normal phenomenon. Another type is abnormal wear of the brake discs, such as uneven lines, which can lead to a decrease in braking force. The solution is to replace the brake discs and pads as soon as possible.
6. Brake hardening: Brake hardening is usually caused by a failure of the vacuum brake pump. The vacuum brake pump has two chambers, one connected to the intake manifold and the other connected to the external atmosphere. When the engine is working, the intake manifold takes in air, creating a negative pressure chamber. The other positive pressure chamber is connected to the atmosphere. When braking is needed, the pressure difference between the two is used to generate assistance. By applying pressure to the brake fluid, the brake pads and discs rub against each other, thereby generating braking force.
7. Brake deviation: When braking, the steering wheel deviates and the vehicle body deviates from the straight track. This type of malfunction is caused by uneven braking force on both sides.