First of all, you have to distinguish the abnormal sound, whether it is screaming, muffled, or screeching.

1. If it is screaming, the first thing to check is that the brake pads are running out (alarm pads sound). If it is a new pad, check to see if there is any foreign matter caught between the brake disc and the pad.

2. If it is muffled, it is mostly the problem of the brake caliper, such as the wear of the movable pin, the falling off of the spring plate, etc.

3. If it's a shrill call, then there are more problems. There may be problems with the calipers, brake discs, and brake pads. If the sound is persistent, first check whether there is a drag brake. Poor reset of the caliper will cause the disc and the disc to rub for a long time, and under certain conditions, an abnormal sound will occur. Then check whether there is any foreign matter stuck between the film and the disc. If it is a new piece, it depends on whether the brake disc has grooves, because local friction will cause abnormal noise. If there is no problem with the disc, consider whether the brake pads are too hard, or the muffler pads are installed incorrectly.

If the noise occurs when braking, the brake pads are too hard.

To sum up, the brake is completed by the caliper, the brake pad and the brake disc, and all three may produce abnormal noise. But often people blame the brake pads for the problem.

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