Squeaking brakes are one of the most common complaints, and the cause ranges from completely harmless to a clear signal that it is time for new pads. Here is how to tell them apart.
Harmless squeaks
- Morning or after-rain squeal. A light film of rust forms on the rotors overnight or in damp weather. The first few stops scrape it off and the noise disappears. This is normal and not a problem.
- Certain pad compounds. Some harder pads make a bit more noise by nature, especially when cold. If it goes away as the brakes warm up and stopping feels normal, it is usually cosmetic.
Squeaks that mean service
- Wear-indicator squeal. Many pads have a small metal tab that scrapes the rotor when the pad gets thin, making a steady high-pitched squeal - often when you are not pressing the brake. That is the pad telling you it is near the end.
- Missing or worn hardware. Old, rusty clips and shims let the pad vibrate and ring. New pads should always go in with a fresh brake hardware kit to stay quiet.
- Glazed pads or rotors. Overheated pads can glaze over and squeal. Bedding new pads in correctly helps prevent this - see our install guide.
When squeal turns to grinding
A squeal is a warning; a grind is a deadline. Grinding usually means the friction material is gone and metal is contacting the rotor, which damages the rotor fast. Do not keep driving on grinding brakes - replace the pads promptly. Find the correct set on the brake pads by vehicle page.