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What Causes the Squeaking Noise of Brake Pads on Rainy Days?

1 Answers

TeaganRose

07/29/25 9:05am

On rainy days, the squeaking noise from brake pads is caused by fine sand carried by rainwater adhering to the brake discs. After rain, the brake discs may rust and develop tiny particles. Brake pads come in hard and soft varieties—hard pads are more wear-resistant, but if there are small particles between the hard pads and the gray cast iron brake discs, they can produce a sharp squeaking noise. Pressing the brakes a few times to wear off these particles usually resolves the issue. Brake pads are critical safety components in a car's braking system, consisting of a steel plate, an adhesive heat-insulating layer, and a friction block. The steel plate is coated to prevent rust, and the coating process is monitored using an SMT-4 furnace temperature tracker to ensure quality by checking the temperature distribution during coating.

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