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What Causes the Squealing Noise When Lightly Braking at Low Speed?

1 Answers

LaEmilio

07/29/25 4:59pm

Low-speed braking squealing may be caused by sand or other foreign objects between the brake pads and brake discs, or excessive wear of the brake pads, leading to the exposure of friction material fixing points that rub against the brake discs or brake calipers, producing abnormal noises. Below are the relevant explanations: Replacing Brake Pads: First, check whether the brake pads are nearly worn out (indicated by the wear indicator). If the brake pads are worn out, a new set of brake pads needs to be installed. Typically, brake pads have a wear indicator pin that contacts the brake disc when the pad wears down to a certain level, causing a metal-on-metal squealing noise. If the pads are new, check for any foreign objects trapped between the brake disc and pad. Inspection and Repair: If the abnormal noise is accompanied by brake system failure, inspection and repair are necessary. Missing or damaged brake disc mounting screws or insufficient lubrication can also cause brake noise. Abnormal wear on the brake disc may result from a dirty disc surface, uneven material density, excessively high operating temperatures, or mismatched installation torque. If the brake disc has deep grooves due to wear, it must be replaced with a new one.

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