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What Causes the Sound of Grinding Brake Discs When the Car Moves?

1 Answers

MacKaleb

09/06/25 8:44am

When the car starts, the sound of grinding brake discs is due to the excessively hard friction material in the brake pads. Here is a related introduction about brake pads: 1. Concept: A brake disc, simply put, is a round disc that rotates as the car moves. The brake caliper clamps the brake disc to generate braking force. When the brake is pressed, it clamps the brake disc to slow down or stop the car. Brake discs provide effective braking and are easier to maintain than drum brakes. 2. Function: Brake discs certainly serve a braking function, with their braking force coming from the brake caliper. Typically, the brake caliper has a fixed inner part where the piston pump is located, while the outer part is a clamp-like structure. The inner brake pad is fixed on the piston pump, and the outer brake pad is fixed on the outer part of the caliper. The piston is pushed by the pressure from the brake fluid line, moving the inner brake pad. At the same time, through reaction force, it pulls the caliper, causing the outer brake pad to move inward. Both pads then press against the brake disc, generating braking force through friction between the disc and the inner and outer brake pads. In this process, the piston is pushed by brake fluid, which is hydraulic oil used to assist the engine. For the handbrake, a cable is used through a lever mechanism to forcibly pull the brake pads, pressing them against the brake disc to generate braking force.

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