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What are the 5 Common Faults in Braking Systems?

1 Answers

RyanLee

07/30/25 2:12am

The 5 common faults in braking systems are poor braking efficiency, brake failure, brake drag, braking deviation (unilateral), and excessive free travel of the brake pedal. The causes of poor braking efficiency in hydraulic braking systems can generally be determined based on the brake pedal travel (commonly referred to as height), the soft or hard sensation when stepping on the brake pedal, the stability after pressing the brake pedal, and the increase in pedal height during continuous braking in border areas. If brake failure occurs, stop immediately and inspect. First, observe whether there is any brake fluid leakage, such as at the dust boot of the master cylinder pushrod. If there is severe brake fluid leakage at the master cylinder pushrod dust boot, it is mostly caused by the master cylinder cup being flipped or severely damaged. If there is a large amount of brake fluid at the edge of the wheel brake drum, it indicates that the wheel cylinder cup is flipped or severely damaged. Brake fluid leakage in the pipelines is generally obvious. If there is no brake fluid leakage, check whether the brake fluid in the master cylinder reservoir is sufficient. If all or a single wheel still has braking function after releasing the brake pedal, it indicates brake drag. If brake drag occurs while driving and all wheel brake drums are overheated, it suggests a fault in the master cylinder. If a single brake drum is overheated, it indicates an issue with the wheel brake. If the fault is in the master cylinder, first check the free travel of the brake pedal. If there is no free travel, the gap between the master cylinder pushrod and the piston is usually too small or nonexistent. If the free travel is normal, remove the plug of the master cylinder reservoir, press the brake pedal, and observe the return flow. If there is no return flow, the return hole is blocked. If the return flow is slow, check whether the brake fluid is too dirty or too viscous. If the brake fluid is clean, the master cylinder cup and skirt may have expanded, or the return spring is too soft, so the master cylinder should be disassembled for inspection.

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