Squeaking brakes: causes and fixes

Possible causes

1. 1. Worn brake pads

   Many pads have a small metal tab that rubs on the disc and squeaks on purpose when the friction material is almost gone: it is a warning. If the squeak comes with every stop and goes away when you release the pedal, this is the most likely cause.

   See brake pads →

2. 2. Scored or lipped discs

   A worn disc forms a ridge on its outer edge and grooves on its surface. New pads on a disc like that squeak and brake worse. If you feel the ridge with your fingernail, replace the discs together with the pads, always in pairs on the same axle. The minimum thickness is also stamped on the disc: if it has worn below that value, the disc must be replaced.

   See brake discs →

3. 3. Missing springs and shims

   Pads are held still in the caliper by springs and anti-noise shims. If they are missing or bent, the pad vibrates and sings, especially at low speed. They are cheap and are replaced together with the pads.

   See pad accessory kits →

4. 4. A sticking caliper

   The caliper has to slide on its guide pins. If the pins are dry or the boots are torn, the pad stays against the disc: a constant squeak, a hot wheel after a drive, a car that pulls to one side.

   See caliper guide sleeve kits →

What you can check yourself

Look at the pad thickness between the wheel spokes: the minimum is set by the manufacturer, usually around 2-3 mm, and below 3 mm it is already worth replacing them. Run your fingernail over the edge of the disc. After a drive, bring your hand close to the wheels without touching them: one wheel much hotter than the others points to a caliper that is dragging. If you are experienced you can take the measurement yourself; if in doubt, go to a workshop: brakes are a safety system.

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