Machining of brake discs
When you check the status of the brake disc turns out that its surface are scratches and profound risks as well as other damage, then grind or pierce the brake disc again to make them suitable for use. Both sides of the brake disc should be handled at the same depth, the two sides of the disc are parallel to each other, and the thickness of the disk should not be less than 23.0 mm for the front disc and 8.0 mm - for the rear.
Check working surface runout of the brake disc without removing it from the car by means of the measuring device on the outer edge. What set the pin meter at a distance of about 5 mm from the outer edge of the brake disc and slowly tapped. If the reading is greater than allowable, replace the disc or grind it.