What Causes the Abnormal Noise When Releasing the Brake at Car Start?
4 Answers
Abnormal noise when releasing the brake at car start is due to damage in the brake system. The specific reasons are as follows: 1. Brake Pads: Abnormal clearance in the brake pads. 2. Brake Disc: Uneven hardness of the brake disc, affecting the uneven surface of the brake pads. 3. Braking: Release the brake once before the vehicle comes to a complete stop, then lightly apply the brake until the vehicle stops moving. 4. Engine Braking: When braking while the vehicle is in a curve, reduce the speed sufficiently through braking. However, if it's too late to slow down, the brake can be used briefly according to the situation. Emergency braking on slippery curved roads can easily cause the tail to swing out, which can be mitigated by downshifting the gearbox and utilizing engine braking to slow down.
I've been driving for half my life, and the strange noise when starting and releasing the brake often comes from rusted brake pads or dust getting stuck. Especially after rain or in humid weather, metal surfaces are prone to corrosion, producing a squeaking sound when the pedal is released. After long-term use, if the brake pads wear unevenly or lack sufficient lubrication during installation, they can also create sharp grinding noises. Driving in high-temperature environments can cause metal changes during the cooling process, which may also lead to unusual sounds. I recommend a simple self-check: press the brakes a few times to see if the noise disappears. If it persists, it's best to visit a repair shop and have a mechanic check the brake pad thickness and cleanliness to avoid affecting braking performance and creating safety hazards while driving. Regular maintenance is crucial for extending component lifespan—never underestimate these minor issues.
When driving daily, my car always makes strange noises when starting, like metal scraping. I asked friends who know about cars, and they said it might be due to rust or sand particles on the brake disc surface, which is more likely to happen in humid conditions. Another common reason is aging or deformation of the brake pads, which can wear out over time and cause abnormal friction when releasing the pedal. I'm also worried if there's a foreign object stuck in the brake system, as lightly pressing the brakes a few times can alleviate some of the noise. However, ignoring this issue can lead to the noise getting worse, potentially shortening the brake lifespan and increasing driving risks. A cost-saving approach is to first check the condition of the brake pads yourself—if they're too thin or dirty, you can replace them yourself, but a professional inspection is more reliable.
As a car enthusiast, I've modified my braking system several times. The squeaking noise during startup could be due to the new brake pads being in the break-in period, or metal friction caused by aging components. Sometimes, it's the loose suspension system affecting the brake parts during acceleration. Insufficient cooling can also cause sudden temperature changes in the brakes, leading to noise. Weather factors shouldn't be ignored either; rust on brake discs after rain often causes squeaking. Preventive measures include using brake rust remover for cleaning and checking heat dissipation after high-speed driving. Although the noise might seem minor, prolonged neglect can damage overall performance. So, don't take it lightly—regular vehicle maintenance is key.
