A:

Analysis: Excessive wear of brake pads and brake discs may cause the back plate to move in the brake caliper.If this is the case, then the back plate of the worn brake pad has actually loosened in the bracket (located inside the brake caliper), resulting in a groove at the junction of the small end of the brake disc and the brake surface.

Solution: Please replace the brake discs and brake pads.Check the brake calipers and, if necessary, repair the brake calipers.

A:

Analysis: Excessive or complete wear of the brake pads causes the brake pad to come into contact with the brake disc (metal to metal), thereby damaging the surface of the brake disc.

Solution: Please replace the brake discs and brake pads.Where applicable, please confirm whether the brake pad wear warning indicator is working properly

A:

Analysis: The brake discs were not checked regularly or the brake discs were not replaced in time.

Solution: Please thoroughly check the braking system and its associated components.Replace all faulty parts, install new brake discs, and tighten the brake discs in accordance with the tightening torque and sequence.At the same time, please be sure to regularly inspect and maintain the brake discs in the future.