What Causes the Feeling of Scrubbing Under the Car Chassis When Braking?
2 Answers
The reasons for feeling scrubbing under the car chassis when braking: 1. The brake discs or pads may produce noise due to rust or hard spots, which usually occurs when the vehicle first starts moving and improves after a few brake applications. 2. Noise from the suspension system and pressure bearings, as rubber components age and harden, causing noise when braking due to force, which may improve after the car warms up. 3. A faulty brake caliper, leading to noise; check if the brake caliper is malfunctioning. 4. Noise from friction between the brake disc and brake pads, possibly caused by moving interference between rotating components like wheels or axles and other related parts or foreign objects nearby.
I've been driving for over a decade and often encounter that piercing metallic scraping sound from the chassis when braking, like metal dragging on the ground. This is mostly due to brake system issues - either the brake pads are worn too thin or uneven, causing abnormal noises when pressed, sometimes accompanied by loose underbody panels that become more noticeable on bumpy roads. Another possibility is foreign objects stuck in the wheel hub gap, like small stones or debris lodged near the brake discs, which create clanking sounds when braking. Don't ignore it - I recommend immediately visiting a 4S shop or reliable repair shop for inspection, while also checking for suspension oil leaks or deformation to prevent sudden loss of control while driving. Regular vehicle maintenance truly saves a lot of trouble, especially cleaning chassis mud before rainy seasons, which can prevent such problems.
