What Causes Brake Noise When Starting?
2 Answers
Reasons and solutions for brake noise when starting: 1. New car or recently replaced brake pads producing noise This is usually because the brake pads and brake discs are brand new and haven't gone through the break-in period, resulting in abnormal sounds. Solution: The noise should disappear after some use, which is normal. 2. Foreign objects between brake pads and brake discs causing noise While driving, sand particles may enter between the brake pads and discs, sometimes causing friction noise. Solution: Clean the foreign objects from the brake system. 3. Low temperature causing brake noise Low-frequency noise when braking during cold starts. Due to low temperatures, rubber components in the chassis suspension become stiff, and some may vibrate with the frame, causing low-frequency noise from the brake calipers or suspension system. Solution: Drive for a while until the vehicle warms up. 4. Loose or aged suspension/chassis components causing brake noise Missing or damaged brake disc mounting screws can also cause brake noise. Loose or aged components like shock absorber mounting screws, stabilizer bar rubber bushings, or ball joints can cause brake noise while driving. Solution: Regular inspection and replacement. 5. Brake disc corrosion causing brake noise Brake discs and pads may corrode due to water exposure or prolonged parking, especially after long-term handbrake use, causing adhesion between discs and pads and initial driving noise. Solution: Inspect and replace brake discs. 6. Severely worn brake pads/discs causing abnormal noise Brake pads usually have wear indicators. When pads wear to their limit, the indicator rubs against the disc, producing noise. Worn brake discs may also cause noise due to surface contamination, uneven material density, excessive operating temperature, or improper installation torque. Solution: Inspect and replace brake pads or discs.
I've encountered quite a few cases of clunking sounds when braking. The most common cause is a thin layer of rust on the brake discs, especially when starting the car after it's been parked for a day or two in humid conditions - the rust creates a screeching noise when braking. Another major issue is when brake pads age and harden or develop frayed edges, causing squeaking sounds against the discs. Small stones or debris lodged in the pads can also produce similar noises. Some vehicles experience more pronounced sounds when cold due to insufficient lubrication or lack of grease in brake calipers, causing pins to stick. Safety shouldn't be compromised - prolonged neglect may lead to disc scoring or reduced braking performance. I recommend warming up the car for a few minutes and applying the brakes repeatedly to see if the noise disappears. If it persists, gently sand the pad edges with fine sandpaper or seek professional cleaning at a workshop. Additionally, parking in less humid areas can help reduce rust formation.
