* Brake pad shims: These are thin metal plates attached to the back of brake pads. They help dampen vibrations and reduce noise. If the shims are rubbing against the caliper or other parts, they can squeak. Sometimes a shim will come loose during installation.
* Brake pad material: Some brake pad materials are inherently more prone to squeaking than others. This is often due to the composition of the friction material.
* Insufficient lubrication: Certain parts of the brake system need lubrication during installation. If the caliper pins or slides weren't properly lubricated with a high-temperature brake grease, squeaking can result.
* Contamination: Dirt, grease, or other contaminants on the brake rotor or pads can cause squeaking. Ensure the rotors were thoroughly cleaned before installation.
* Improper installation: If the brakes weren't installed correctly, components might be misaligned or rubbing, leading to squeaking. This includes the pads not seating properly in the caliper.
* Brake rotor imperfections: If the brake rotor is warped, scored, or rusty, it can cause squeaking even with new pads.
What to do:
1. Check for obvious problems: Carefully inspect the brakes. Look for anything rubbing, loose shims, or contamination.
2. Listen closely: Try to pinpoint the location of the squeak. Is it coming from both sides, or just one? This helps diagnose the problem.
3. Check the caliper pins and slides: These should move freely. If they're stiff or sticking, they need lubrication with the appropriate high-temperature brake grease.
4. Drive the car: Sometimes, the squeaking will go away after the brakes are bedded in (the friction material settles and conforms to the rotor).
5. Return to the installer: If the squeaking persists or is severe, take the vehicle back to the mechanic who installed the brakes. It's possible there's a more serious issue requiring professional attention.
Ignoring brake squeaks can lead to more serious problems down the line. It's best to address the issue promptly.
