What causes a clunking sound when starting after braking?
3 Answers
This is caused by the brake disc and brake pads sticking together due to rust, which is a normal phenomenon. Below is additional information: 1. Function of brake pads: To ensure better coordination between the brake pads and brake disc, maintain the proper operation of the braking system, and restore normal braking performance. 2. Brake disc maintenance methods: Develop good driving habits, avoid sudden braking, regularly inspect the brake pads and brake disc, check the thickness of the friction material, have a professional inspect the brake shoes, and use original equipment manufacturer (OEM) provided brake pads and discs when replacing. 3. Conditions for replacing the brake disc: When the thickness of the brake disc is less than the minimum maintenance standard allowed by the vehicle manufacturer or when the wear indicators on the brake disc come into contact with the disc.
I recall this issue occurring a few times over my years of driving, especially after winter or rainy days, where a clunking sound would happen during startup. That’s often because the brake pads stick to the caliper due to moisture or rust, and when you release the brakes to start moving, they suddenly separate, producing a sound like peeling off stuck tape. It could also be due to insufficient lubrication in the brake system’s guide pins, causing sluggish resetting, or worn bushings in the suspension system, creating friction noise during transitions between motion and stillness. I recommend regularly checking brake components for rust spots, especially after parking for more than a day—lightly pressing the brakes a few times can help prevent sticking. If the noise persists, it’s best to visit a repair shop, use a jack to remove the wheel for inspection, and not ignore it to avoid potential brake failure or other safety hazards. Additionally, pay attention to parking conditions—avoid high-humidity areas—and maintaining overall vehicle upkeep is key.
I've also experienced a clunking noise when starting the car, especially after recent rain or when the vehicle has been parked for a long time. A friend told me it might be due to the brake discs and pads corroding and sticking together in humid weather, making noise when separating during startup; or it could be loose fasteners between the tires and rims causing collisions during power transfer. I've tried lightly pressing the brakes a few times before cold starts to reduce sticking, which works well. Also, check if the brake guide pins lack lubrication—adding some specialized silicone-based lubricant can help. If the noise occurs frequently, worn ball joints or support points in the suspension system might be the culprit, but don't attempt DIY repairs. Have a professional shop diagnose it with proper tools for peace of mind. Remember, parking habits matter too—avoid keeping the brakes fully engaged for extended periods or parking in standing water to prevent rust and prolong component lifespan.
