What causes brakes to make noise (squeal)?

Lack of friction material on the backing plate is the most common result of brake noise. Another reason for brake noise is that the pads are loosely fitted into the caliper. Debris caught between the brake pad and rotor is another of the common reason’s for brake noise. Loose lug nuts or caliper hardware. Cracked or worn rotors. Uneven finish on reconditioned (turned) rotors. Loose or missing brake hardware (anit-rattle clips, shims) can be responsible for brake noise. There are steel springs and pins which allow the pads mounted in the brake calipers to move freely without rattling and vibrating excessively. However, due to the nature of your brake system, these pins and springs wear and loosen their tension over time. Worn pins can result in binding, squealing, brake fade, uneven braking and reduced pad life. Sometimes brake noise on certain vehicles is completely normal and no maintenance is required. Brake noise can be caused by the everyday vibrations of daily driving on the brake ... more

Lack of friction material on the backing plate is the most common result of brake noise. Another reason for brake noise is that the pads are loosely fitted into the caliper. Debris caught between the brake pad and rotor is another of the common reasons for brake noise. Loose lug nuts or caliper hardware. Cracked or worn rotors. Uneven finish on reconditioned (turned) rotors. Loose or missing brake hardware (anit-rattle clips, shims) can be responsible for brake noise. There are steel springs and pins which allow the pads mounted in the brake calipers to move freely without rattling and vibrating excessively. However, due to the nature of your brake system, these pins and springs wear and loosen their tension over time. Worn pins can result in binding, squealing, brake fade, uneven braking and reduced pad life. Sometimes brake noise on certain vehicles is completely normal and no maintenance is required. Brake noise can be caused by the everyday vibrations of daily driving on the brake ... more