What Causes Hard Car Brakes?
2 Answers
The reasons for hard car brakes are: vacuum booster failure, severely worn brake pads, or insufficient brake fluid. If there is an issue with the brake system, it is essential to immediately visit a 4S shop for inspection and repair. It is relatively normal for the brake pedal to become hard because the brake vacuum assist system relies on the vacuum generated by the engine under normal operating conditions to provide braking assistance. During startup, the vacuum level decreases, directly affecting the braking assist force. The brake pedal is the pedal that restricts power, i.e., the pedal for the foot brake (service brake). The brake pedal is used for deceleration and stopping, and it is one of the five major operating components in car driving. Its usage frequency is very high, and how the driver controls it directly affects driving safety.
I have experienced the brake pedal becoming hard while driving, which is most likely due to a problem with the brake booster. The brake booster relies on engine vacuum to provide assistance. Once there is a leak in the vacuum line or damage to the internal diaphragm of the booster, the brake pedal becomes very hard, requiring significant force to press down. Brake fluid aging or air contamination can also cause the brake pedal to harden, leading to sluggish brake system response and compromising driving safety. Another possible cause is the linkage mechanism under the brake pedal seizing or lacking lubrication, resulting in poor movement. I recommend promptly inspecting the brake system—start by checking the brake fluid reservoir for leaks or low fluid levels. It’s best to visit a professional repair shop for a thorough inspection. Safety comes first; brake issues should never be taken lightly, especially at high speeds where the risks are significant.
