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What's the reason for a clunk sound when releasing the brake at start?

2 Answers

ReidDella

07/24/25 3:27am

Start releasing the brake with a clunk sound is due to a problem with the fit clearance between the brake pads and the brake caliper or brake disc. It is recommended to adjust the brake pads after this situation occurs. The car's braking system is very important, as it relates to the driving stability and safety of the vehicle. The main components of the braking system include the vacuum booster pump, master cylinder, wheel cylinder, brake pads, and brake disc. Brake pads and brake discs are two wearing parts that need to be replaced regularly, as these two components will wear out over time. The brake fluid in the braking system needs to be replaced periodically, as brake fluid is a liquid that easily absorbs water. If the water content in the brake fluid is too high, it will lead to reduced braking force and extended braking distance.

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SaraRose

08/10/25 11:01pm

As an ordinary car owner who has driven for decades, I've encountered this situation quite often—the clunking sound when releasing the brake to start moving. Usually, it's caused by parts cooling and contracting after parking, leading to the brake pads or calipers shifting when you press the accelerator. Don’t underestimate this minor issue—it could indicate worn suspension bushings or loose brake pads. If this happens in rainy weather or on mountain roads, reduced braking performance could easily lead to an accident. I suggest testing on a flat road; if the sound persists, visit a repair shop immediately. Developing a regular maintenance routine, lubricating key connection points every six months, can prevent such noises and extend your car’s lifespan, ensuring safer driving.

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