squeal shim
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anti-squeal shim — A shim (metal plate) placed behind the brake piston or the brake pad to reduce noise when the brakes are applied … Dictionary of automotive terms
shim — A thin spacer installed between two parts to increase the distance between them. See adjusting shim anti squeal shim valve shim … Dictionary of automotive terms
Disc brake — Close up of a disc brake on a car On automobiles, disc brakes are often located with … Wikipedia