2. Measure the thickness of the brake disc at its thinnest point (arrow on the accompanying illustration). At the service station, there is a special caliper or micrometer clamp for this purpose, since the disc wear has an edge. You can measure the thickness of the disc using a regular caliper. In this case, a lining of a certain thickness must be placed on each side of the brake disc (for example, a small coin). In this case, it is necessary to subtract the thickness of two coins from the measurement result obtained.
Caution: It is necessary to take measurements at several points on the brake disc.
3. The dimensions of the brake disc are given in Specifications.
4. If the wear limit of the disc is reached, it is necessary to replace both discs of the same axle.
5. If there are large cracks or grooves more than 0.5 mm deep, the brake disc must be replaced.
6. Observing the direction of rotation, install the wheel and secure it. Lower the car onto the wheels and only then tighten the wheel mounting bolts crosswise to the torque 120 Nm.
[Content source: the specified website «audimanual.ru»]