Fix squeaky disc brakes

Contamination is the most common cause of squeaky disc brakes. Dirt from the road or trail, chain lube, grease, or other residues can collect on the rotor, caliper, or brake pads. Brake pads are especially prone to picking up dirt and oil.

Solution: Clean the rotor and caliper with brake cleaner or warm water and dish soap. If the brake pads are contaminated, replace them. You can try lightly sanding the top layer of the pad in circular motions with fine sandpaper, but replacing the pads is usually the more reliable fix.

Moisture can cause disc brakes to squeal. This often happens in the rain or after washing your bike.

Solution: If the noise only occurs when wet, apply the brakes firmly a few times to dry the system. If it continues to be an issue, switching from sintered metal pads to quieter organic pads can reduce noise. Sintered pads generally offer better braking performance in harsh conditions.

A whining or squealing disc brake can indicate worn pads. The pad material should be at least 1 mm thick.

Solution: Replace worn pads with new ones. See our guide on replacing brake pads for step-by-step instructions.

Long descents and constant braking can cause brake pads to glaze. This often happens when you drag the brakes instead of braking firmly and releasing. Glazed pads reduce braking performance and can cause squealing. You can identify them by their shiny surface.

Solution: If there's enough pad material left, lightly sand the surface in circular motions with fine sandpaper. If the pads are worn, replace them.

Not all rotors and brake pads work well together. Mixing third-party components can sometimes lead to squeaking.

Solution: Check the rotor manufacturer’s compatibility recommendations before choosing brake pads. Using rotors and brake pads from the same manufacturer is usually the safest option.