What Do Squeaky Brakes Mean?
Squeaky or squealing brakes may indicate worn brake pads, a rotor in need of resurfacing or no problem at all in the case of modern semi-metallic brake pads.Semi-metallic Brake PadsModern brake pads consist of semi-metallic materials instead of the older asbestos padding, according to Trust My Mechanic. These semi-metallic pads produce a certain amount of squealing as part of their normal operation.Brake Pad ProblemsBrake pads that fit too loosely on the calipers that squeeze them during braking can produce a squealing noise. Squealing pads may also suffer from a lack of silicone lubricant.Rotor SurfacesBrake pads, rotors and calipers can produce a squealing noise through their interaction. Resurfacing the metallic surfaces of the rotors can reduce squealing.Warning NoiseSome General Motors cars include a small piece of metal on their brake pads that is meant to squeal in order to warn the driver when brake pads are running low.Reducing SquealsRepairing, replacing or lubricating brake
