A:

Analysis: The brake disc did not run in well.This phenomenon usually occurs after the brake disc or brake pad is newly installed, and the surface color between the new brake pad and the brake disc will change slightly.If a new brake disc is installed or there is no good run-in between the brake pads, the friction surface will overheat, resulting in metallurgical changes in the friction surface.

Solution: Replace the brake discs, that is, avoid frequent braking during the early driving of the vehicle.

A:

Analysis: Blue spots are a precursor to cracks.This is caused by metallurgical changes in the surface material. This change will make the surface material hard and fragile. This is the characteristic of the brake that exceeds the normal design limit.This may be caused by frequent braking or abnormal braking, such as aggressive driving or overloaded driving.

Solution: Replace the brake discs, avoid abuse of the brake system and make more use of the engine to help slow down.