1. Mount the indicator with holder on the brake caliper and rest the measuring tip approximately in the middle of the friction surface of the disc, as shown.
2. Rotate the brake disc slowly and measure the runout. It should not exceed 0.13 mm. The runout of the brake disc is not necessarily the result of only a defect in the disc itself, because. in part, runout is added to it due to gaps in the wheel bearing.
3. When the brake disc rotates, it is necessary to check its braking surface for cracks, scuffs, etc. If these defects are present, the brake disc, as a rule, must be replaced.
Brake discs can be ground to restore performance. The minimum allowable disc thickness is given in Specifications. In this case, it is necessary to monitor the preservation of the flatness of the disk.
The brake disc is removed as follows:
1. If the wheel has already been removed, as discussed above, remove the wheel bolt used to check the runout.
2. Remove the brake disc as described above.
3. Tie the caliper with wire to the chassis.
4. Remove both bolts shown and separate the guide from the brake disc.
5. Unscrew the fastening bolt in the end surface of the brake disc with a special key. The bolt has a Torx head.
6. Remove the brake disc from the wheel hub. If necessary, you can use a rubber mallet for this.
7. Before installing the brake disc, clean the mating surfaces of the disc and wheel hub with fine emery cloth. If a new brake disc is installed, it must be cleaned of grease.
8. Install the brake disc and tap it with a rubber mallet.
9. Screw in and tighten the mounting bolt.
10. Check the brake disc for runout as described above. An unexpected beating may be due to the ingress of foreign particles between the mating planes of the disc and the hub. Then disassemble the connection again, clean and reassemble.
11. Install the shoe guide and tighten its fastening bolts to 212 Nm.
12. Install the brake pads as described above.
13. Lower the vehicle and tighten the wheel bolts to 110 Nm.
Attention! Light alloy wheels are fastened with a torque of 120 Nm.
Instruction. The thickness of the brake discs can be measured without removing them. This is done with a caliper. Be aware of the difference in performance.
Replacement of a casing of a brake disk
In case of deformation of the casing, it can be replaced. To do this, remove the caliper, brake disc and wheel hub. After that, you can unscrew the three mounting bolts and remove the casing. Tighten the bolts of the new casing with a torque of 13 Nm.
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