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What Causes the Squeaking Noise When Starting and Braking?

2 Answers

KyleAnn

07/29/25 6:26am

The causes of squeaking noise when starting and braking are: 1. Metal particles or small gravel between the brake pads and brake disc; 2. Excessive wear of the brake disc or brake drum; 3. Overly hard brake pads; 4. Rusty brake caliper; 5. Inflexible handbrake cable; 6. Slow return of the master brake cylinder. Solutions for brake squeaking include: 1. Checking the lubrication of the shock absorber top rubber or buffer rubber; 2. Breaking in new brake friction pads; 3. Replacing brake pads promptly; 4. Cleaning foreign objects from the surface of the brake disc. Braking, also known as deceleration, refers to the action of stopping or reducing the speed of moving locomotives, vehicles, other transport tools, or machinery.

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Ellie

08/12/25 9:52am

I've encountered this situation many times, especially on rainy days or after the car has been parked for several days. Usually, it's because the brake disc surface has some rust, and when you step on the brake to start, the rusted area rubs against the brake pads, making that squeaking sound. It should go away after driving for a while and the friction cleans it off. If there's a sharp metallic scraping sound every time you start, it might be that the brake pads have worn to their limit, and the warning metal piece is making contact with the brake disc as an alert signal. Another possibility is that there's a small stone or other foreign object stuck in the brake caliper. I would first check the thickness of the brake pads; if it's below 3mm, they need to be replaced, otherwise, it not only wears out the brake discs faster but also affects safety. If the brake pads have just been replaced, it might be that the new brake pads haven't fully broken in yet.

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