* Brake Pad Bedding-In: New brake pads need to be "bedded in" properly. This means the friction material needs to mate with the rotor surface. During this process, some glazing or transfer of material can occur, leading to squeaking until the pads and rotors fully adapt to each other. Insufficient bedding-in is a major culprit. This often resolves itself with more moderate braking over a longer period of time.
* Contamination: During installation, brake dust, grease, or other contaminants might have gotten onto the brake pads or rotors. These contaminants can interfere with proper pad-rotor contact and cause squeaking.
* Hardware: The brake pad hardware (clips, shims, etc.) can sometimes vibrate and squeak against the caliper or rotor. These components are often made of metal and can resonate at low speeds.
* Rotor Issues: Although less likely with new brakes, there could be issues with the rotors themselves, such as a slight imperfection in the surface, causing the pads to vibrate.
* Pad Composition: The composition of the brake pads can influence their propensity to squeak. Some materials are inherently noisier than others.
* Caliper Issues: While rare with new brakes, a sticking caliper piston or a problem with the caliper guides can cause uneven pad contact and squeaking.
* Lack of Anti-Squeal Lubricant: Many brake pad kits come with anti-squeal lubricant. This should be applied to the backs of the brake pads and other appropriate areas to reduce friction and vibration. Failure to use it can lead to squeaking.
What to do:
1. Drive more aggressively (but safely!): Apply moderate braking from higher speeds (above 20mph) several times to help bed in the pads. This should be done in a safe, controlled environment away from traffic.
2. Check for contaminants: Inspect the brake pads and rotors carefully for any grease or other foreign material. Clean them thoroughly if necessary with brake cleaner.
3. Check for loose hardware: Ensure all brake pad hardware is correctly installed and secure.
4. Check the rotors: If you notice any imperfections, consult a mechanic.
5. Consult a mechanic: If the squeaking persists after trying these steps, it's best to have a mechanic inspect the brakes to rule out more serious issues.
If the squeaking is severe or accompanied by other symptoms like vibration or a grinding noise, don't ignore it—get professional help immediately. Brake safety is paramount.
