Work order:
- raise the front of the car and place supports under the body;
- remove the wheel from the desired side;
- remove the wheel caliper assembly from the brake disc as described above and tie it up away from the work area without putting tension on the brake hose;
- mark the position of the brake disc on the hub in an accessible way;
Fig. 7.6. Screws for fastening the brake disc to the wheel hub (arrows)
- using a T40 socket wrench, unscrew the two screws securing the disc to the hub (Fig. 7.6) and remove the disc. If removing the disc is difficult, tap it with a rubber hammer;
- clean the disk from dirt and rust;
- check the brake disc. Measure the disc thickness in several places with a micrometer and compare it with the permissible one. If at least one place the disc thickness is less than the permissible one, both discs must be replaced;
- minor scratches and grooves on the disc surfaces are allowed. In case of significant surface irregularities, the disc can be turned on a lathe, ensuring that the disc thickness does not exceed the permissible limits;
- check the disc for cracks, which may appear in the area of the wheel mounting bolts. If cracks are found, replace both discs;
- clean the mating surfaces of the disc and hub;
- install the disk on the hub according to the marks made and tighten the mounting screws to the specified torque;
Fig. 7.7. Measuring the runout of the brake disc with a dial indicator
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- check the disk runout at several radii using a dial indicator (Fig. 7.7). If the disk runout exceeds the permissible limit, you can try moving the disk by 180°. Install the disk and check the runout again. If the runout exceeds the permissible limit, replace the disk;
- perform the remaining operations in the reverse order of removal;
- finally, press the brake pedal several times to allow the pads to move towards the disc and into working position.