Contents: Examination ↡ Removal and installation ↡
Examination
Measuring the lateral runout of a brake disc (using the example of the front wheel brake mechanism)
1. Assess the amount of play in the wheel bearing and make the appropriate adjustments if necessary (see Chapter Transmission line).
2. Remove the wheels and visually assess the condition of the brake discs. If deep grooves are detected, the discs should be ground to within the permissible limits or replaced (see below).
Note: The disks must also be replaced if the thickness of any of them is outside the lower limit of the permissible range (see Specifications).
[Publication taken from an online resource: Mercedesman.ru]
3. Attach the DTI dial gauge to the hub assembly with the plunger pressed against the side of the disc.
4. Zero the gauge and, by rotating the disk, determine the value of its lateral runout.
5. Compare the measurement result with the requirements Specifications, if necessary, replace the disks (see below).
Removal and installation
Attention! Brake discs must be changed as a set for both wheels of one axle at the same time!
Front brake discs
Front wheel brake disc installation details
61 — Brake disc
64 - Mounting bolt
1. Remove the brake pads (see Section Checking the condition and replacing brake pads).
2. Remove the caliper (see Section Removal and installation of brake calipers).
3. Unscrew the lock bolt (64) and remove the brake disc (61) - the bolt must be replaced without fail.
4. Installation is carried out in the reverse order - before installation, lubricate the mounting surface of the disk with long-life grease type MB No.000 989 63 51.
5. Finally, check the brake fluid level and make the appropriate adjustments if necessary (see Chapter Routine care and maintenance).
Front brake discs
1. Remove the caliper (see Section Removal and installation of brake calipers).
2. Remove the brake pads (see Section Checking the condition and replacing brake pads).
3. Remove the anchor bracket (6) - prepare replacement self-locking bolts.
4. Move the parking brake shoes back.
5. Loosen the lock bolt and remove the brake disc.
6. Installation is carried out in reverse order.
7. Finally, check the brake fluid level and make the appropriate adjustments if necessary (see Chapter Routine care and maintenance).