Rear brake disc — inspection, removal and installation (BMW 3 Series E46)

Note 1: Before starting work, read the note at the beginning of paragraph 4 about the dangers of asbestos dust.

Note 2: If one of the discs needs to be replaced, replace BOTH discs at the same time to ensure even and consistent braking. Replace the brake pads as well.

Examination

1. Block the front wheels, then raise the rear of the vehicle and support it on jack stands (see "Raising and Supporting the Vehicle on Jack Stands"). Remove the affected front wheel. Release the parking brake.

2. Check the disk as described in paragraph 6.

Removal

3. Remove the two caliper bracket mounting bolts, then remove the entire assembly from the disc. Use wire to secure the caliper to the suspension spring, preventing the brake hose from being pulled (Fig. 7.3). If necessary, disconnect the hose from the body mounting bracket.



4. Remove the disk mounting screw (Fig. 7.4).



5. If possible, remove the brake disc from the hub by hand. If the disc does not come off, tap it with a plastic hammer from the back. If the parking brake shoes prevent the disc from being removed, first make sure that the parking brake is completely released, then do the following.



6. Release the parking brake cable completely (see paragraph 14).

7. Insert a screwdriver into one of the wheel bolt holes and turn the knurled knob to release the pads (see fig. 14.5 a, b). After this, the disk can be removed.

Installation

8. When installing a new disc, first wash off the preservative with a suitable solvent.

9. Align the marks made before removal, then install the disc, screw in and tighten the screw that secures it to the required torque.

10. Place the caliper on the disc. Make sure that the pads are in the correct position relative to the disc. Tighten the caliper mounting bolts to the specified torque.

11. Adjust the parking brake shoes and cable (see paragraph 14).

12. Install the wheels, lower the car to the ground and tighten the wheel mounting bolts to the required torque. When finished, press the brake pedal several times to ensure that the pads fit the disc.