When the brake caliper piston’s protective rubber boot gets torn, debris can accumulate in the caliper. When the brakes are applied, brake fluid is sent to the caliper, causing the pistons to engage the brake pads. ![]() Seized-Up Brake Caliper Pistonīrake caliper pistons allow the brake pad to come into contact with the brake rotor. In extreme cases, the pins can seize up completely, causing the caliper to get stuck. When this protective boot wears out, debris or water can enter the slide pin bore, resulting in corrosion and friction between the bore and the caliper slide pin. Each slide pin is covered by a small protective boot designed to stop water and debris from entering. The caliper slide pin allows the caliper to engage and release freely. Usually, when mechanics aren’t careful enough, they can tear the slides when installing new brake pads.Īpplying grease and brake cleaner to rubber slides may help temporarily, but ideally, you should see a mechanic to have them checked. What causes these issues with the rubber slides?
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