How to eliminate abnormal brake noise after car washing

In cold season, after parking for one night, the temperature of the brake disc becomes lower, the material expands with heat and contracts with cold, the gap between the drum and the brake pad changes, and the friction force also changes. When you lightly step on the brake, it will make a strange noise. After running about 100 meters, the sound will disappear with the increase of temperature. Otherwise, if the temperature is low, the rubber on the chassis suspension will harden and the gear gap may be tight. After braking, the vibration of suspension system and calipers will be intensified, and abnormal noise will inevitably be made at this time. When the cold car starts, stepping on the brake will make a low-frequency sound, which will cause the vibration of the caliper and suspension system through the cooperation between the rubber of the chassis suspension and the frame, and make a low-frequency sound. Washing the car can solve the problem of abnormal brake sound. The method is as follows: 1. When braking, the brake pad directly contacts the brake drum or brake disc, forming frictional resistance, reducing the wheel speed and producing the same resistance as the ground. 2. The kinetic energy of the car changes greatly in the process of speed and force change, and the parts of the car also have certain influence. Various vibrations will cause different sounds, but this kind of sound is basically regular, and it will be clear when you get used to it. 3. The surface of the brake pad is rough, and the resistance will change, which is different from what we usually hear. If impurities such as sand are stuck on the brake pad, relatively small sand can fly away after braking several times, but larger foreign objects must be handled manually.