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Why is there a scraping sound from the undercarriage when lightly pressing the brakes?

1 Answers

BlakelyAnn

07/30/25 5:51am

Here are the main reasons for the scraping sound from the undercarriage when lightly pressing the brakes: 1. Brake pad wear: The friction between the brake pads increases when braking, causing abnormal noises. 2. Loose undercarriage components: When the undercarriage is loose, it can cause friction between various parts, leading to abnormal noises. 3. Aging of undercarriage rubber, resulting in reduced performance. 4. Faulty lower control arm. Below is an analysis of the reasons for abnormal noises from the undercarriage: 1. When turning, abnormal noises from the undercarriage may indicate faults in the steering system or suspension system, as the vehicle's tilt during turning causes deformation in the suspension system. 2. When driving on good road conditions, abnormal noises from the undercarriage may be due to faults in the braking system components, such as loose or worn parts, out-of-round brake drums, or uneven brake discs. 3. Abnormal noises from the undercarriage may also indicate issues with the bearings connecting moving and stationary parts. If there is a problem with the bearings, the driver can identify it by lightly pressing the brakes. If the noise remains unchanged during uniform motion, it indicates a bearing issue. 4. When driving on poor road conditions, abnormal noises from the undercarriage are mostly due to suspension system abnormalities or loose braking system components, with the suspension system often producing friction sounds.

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