You can touch the brake disc by hand, if the brake disc groove is deep, and the edge is sharp, it needs to be replaced; Also through measuring tools to detect the thickness of the brake disc, which is the most professional, the use of screw micrometer to measure the remaining thickness of the brake disc, when the total wear depth of the brake disc on both sides of 2mm, it is necessary to replace the brake disc; Some brake discs have wear limit grooves on their surfaces. When the grooves on the brake discs are worn down, they also need to be replaced.
Generally speaking, the car will need to replace a front brake disc when it runs about 60-80,000 kilometers, and the brake disc after it is replaced about 100,000 kilometers, that is, the brake disc needs to be replaced twice.
