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Common Brake Pad Faults?

1 Answers

Melo

07/30/25 6:47am

Common brake pad faults are as follows: 1. Brake pedal not returning: After pressing the brake pedal, the pedal does not return to its original position or returns slowly. This phenomenon is mostly caused by dirt on the wheel cylinder piston. Simply clean the wheel cylinder piston, and ensure that the air in the brake lines and brake fluid is completely bled afterward. 2. Soft brake pedal: A soft brake pedal is very common. Causes include insufficient brake fluid, thinning brake discs and pads, air in the brake lines, or deteriorated brake fluid. The most common issues are deteriorated or insufficient brake fluid. 3. Brake noise: Brake noise mainly occurs when pressing the brake while driving, producing a sharp metal friction sound (very harsh). This may be due to thin brake pads, low-quality brake pads, foreign objects in the brake pads, or rust on the brake discs. Usually, pressing the brake a few more times can alleviate the noise. 4. Brake failure: Brake failure is a very serious issue. Normally, brake failure does not occur unless there are quality issues with the car or faults in the brake system. Brake failure is often related to car quality. When brake failure occurs, first control the direction based on the car's speed, gradually downshift to utilize engine braking, and slowly reduce the speed. When the speed is below 60km/h, consider using the handbrake to slow down (using it at high speeds can cause accidents). 5. Pedal feedback: There are two types of pedal feedback. One is feeling a slight bounce when pressing the brake hard, which is normal. The other is abnormal wear on the brake discs, such as uneven lines. This can cause pedal feedback and reduced braking force. The solution is to replace the brake discs and pads as soon as possible. 6. Hard brake pedal: A hard brake pedal is usually due to a failed vacuum brake booster. The vacuum brake booster has two chambers: one connected to the intake manifold and the other to the external atmosphere. When the engine is running, the intake manifold draws air, creating a fast flow and negative pressure in the negative pressure chamber. The other chamber is connected to the atmosphere. When braking is needed, the pressure difference between the two chambers generates assistance, applying pressure to the brake fluid to create friction between the brake pads and discs, producing braking force. 7. Brake pull: When braking, the steering wheel turns, and the car deviates from its straight path. This fault is caused by uneven braking force on the left and right sides.

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