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What Causes Brake Caliper Noise?

2 Answers

DelHarley

07/29/25 2:35am

Brake caliper noise may be caused by loosening or corrosion of the caliper guide pins, which can be resolved by replacement and lubrication with grease. It could also be the sound of the brake pads hitting the caliper. Additionally, if there are foreign objects between the caliper and brake disc, noise may occur. It's best to have a professional diagnose the specific cause at a repair shop. Below is an expanded explanation: Brake Caliper Concept: The brake system consists of a master cylinder and brake calipers. Simply put, the master cylinder stores brake fluid and has inlet and outlet ports. When the brake pedal is pressed, brake fluid flows from the master cylinder through pipes to the calipers. When the calipers receive pressure, they push the brake pads to friction against the brake drum, achieving braking. Symptoms of a Faulty Brake Caliper: 1. Oil leakage at the connection between the caliper and oil pipe, and a soft feeling when pressing the brake pedal; 2. The steering wheel noticeably pulls to one side after pressing the brake pedal, likely due to uneven brake pad wear or caliper malfunction; 3. After pressing the brake pedal, the pedal does not rise and lacks resistance, commonly referred to as the brake not returning to position.

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Claudia

08/12/25 6:32am

When repairing cars, I often deal with the issue of brake caliper noise. The most common causes are internal piston wear or rust, leading to restricted movement and noise. Additionally, air entering the hydraulic system can cause a 'hissing' sound when braking; if parts are loose or improperly installed, friction noise may also occur. Long-term neglect may affect braking performance, even causing delayed response or failure. It's recommended to promptly check brake fluid levels and condition, bleeding or replacing components if necessary. Prevention is better than repair—regular maintenance can prevent small issues from becoming major problems. If the noise persists, it's best to have a professional shop conduct a comprehensive inspection.

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