What Causes the Abnormal Noise When Drum Brakes Are Applied?
2 Answers
Drum brakes may produce abnormal noise for the following reasons: 1. Break-in period: If it is a new car or newly replaced brake discs and pads, there will be a break-in period during which some abnormal noise may occur. This usually disappears after driving a few hundred kilometers. 2. Foreign objects in the brake pads: There may be small metal particles inside the brake pads, which can produce a sharp, piercing sound when the brakes are lightly applied. 3. Severe wear of brake pads: Generally, brake pads come with wear indicators. When the brake pads wear down to their limit, the wear indicators will rub against the brake discs, producing a sharp metal friction sound.
I've personally experienced the issue of squeaking noises when braking with drum brakes. Last time after driving home on a rainy day, I heard a creaking sound every time I stepped on the brake, initially thinking it was just noise from the wet road surface. But it persisted for several days, growing louder and louder, scaring me into not daring to drive fast. Later, I took it to a nearby repair shop, where the mechanic opened it up and found the brake pads worn down to a thin layer, with some sand and rust accumulated inside the drum. He replaced the new brake pads, cleaned out the debris, and checked the overall structure. Now it's quiet, reminding me not to ignore brake issues, especially after frequent off-road driving. This incident taught me to address minor problems promptly, as they relate to major driving safety concerns—don't wait until real trouble arises to regret it.
