Why does the car make abnormal noise when starting and braking?
2 Answers
There are several reasons for abnormal noise when starting and braking: 1. For automatic transmission cars, the noise is caused by releasing the brake too slowly, resulting in a squeaking sound when starting. 2. The brake disc and brake pads are stuck together due to rust, causing abnormal noise. This usually happens after driving in rainy weather or after the car has been parked for a long time. The brake disc and brake pads rust and stick together, and when the car is started again, abnormal noise occurs. This can be solved by applying butter or special lubricating oil to the connection between the brake pads and the brake caliper. 3. Due to low temperatures, the rubber parts of the suspension become harder, and the surfaces of the brake disc and brake pads also change, resulting in abnormal noise when starting. This will improve after the car warms up. 4. Both the brake disc and brake pads are high-wear items. Every time the brakes are applied, these two parts rub against each other, leading to natural wear over time. When the wear becomes excessive, abnormal noise will occur, so regular inspection and replacement are necessary.
I've been driving for almost 30 years and have encountered quite a few instances of squeaking sounds during starting and braking. The common causes are mainly rust on the brake discs, especially when parked outside on rainy days or in the morning with high humidity—friction upon starting causes that squeaking sound. Another reason is when the brake pads are nearly worn out, and the metal layer directly rubs against the disc, creating loud and dangerous noises. I once delayed addressing it and ended up spending a lot on repairs. Additionally, dust buildup inside the wheel hub or insufficient lubrication of the brake calipers can also cause abnormal noises. For safety, I recommend not ignoring such issues—get your brake system checked at a professional repair shop as soon as possible. Regular maintenance, like rinsing the wheel area during car washes to reduce dirt buildup, ensures a safer and more worry-free drive.
