Symptoms
- Noise present during light, gentle braking
- Noise stops or lessens when braking harder
- No grinding or major performance issues
Likely causes
- CommonPad vibration against the caliper piston or bracket at light pressureLight contact can allow the pad to vibrate slightly, while firm pressure holds it steady.
- CommonMissing or worn anti-squeal shimsThese shims dampen vibration, and their absence is more noticeable at light brake pressure.
- PossibleGlazed pad surface that grips inconsistently at low pressureA hardened surface can behave differently depending on how hard it's pressed.
- Less commonWorn caliper hardware allowing slight pad movementLoose hardware is often most noticeable at lower brake pressures.
What to do
- Note the pattern precisely: light braking squeals, firm braking doesn't.
- Check pad thickness and general condition through the wheel spokes if visible.
- Have a mechanic inspect for missing or damaged anti-squeal shims.
- Have caliper hardware and slide pins checked for wear or looseness.
- Have pads replaced or reinstalled with proper shims and lubrication if that's found to be the issue.
- Consider a different pad compound if the noise continues despite proper hardware and installation.
Tools and parts
Brake pad hardware kit (shims, clips)Search: “brake hardware kit for your car make and model”
When to call a pro
See a mechanic if the noise continues, since it's usually a quick fix involving hardware or shims rather than a major repair.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.