Removal
To remove the rear wheel hub, perform the following operations in sequence.
Fig. 16.3. Rear wheel hub design: A - cars with rear disc brakes; B - vehicles with rear drum brakes; 1 – rear wheel speed sensor (cars with ABS); 2 – bolt (49–59 Nm); 3 – bolt (25 Nm); 4 – wheel speed sensor rotor (cars with ABS); 5 – rear wheel hub assembly; 6 – hub mounting bolt; 7 – Parking brake cable connection; 8 – caliper assembly; 9 – hub mounting nut (177 Nm); 10 – hub cap; 11 – brake disc; 12 – brake drum
1. Loosen the mounting bolt and remove sensor 1 (Fig. 16.3) of the rear wheel speed (vehicles with ABS).
2. Disconnect the parking brake cable.
3. Unscrew the two bolts and remove the caliper 8 as a unit. Without disconnecting the brake hose from the caliper, use soft wire to tie the caliper to the body. Do not stretch or twist the brake hose.
4. Remove the brake disc 11.
5. Loosen the screw and remove the brake drum 12.
6. Using a screwdriver as a lever, remove the hub cap 10.
7. Unscrew hub mounting nut 9.
8. Remove the rear wheel hub 5 as an assembly.
9. Replace the rear wheel hub assembly if the inner race of the hub bearing is worn.
10. Remove rotor 4 of the wheel speed sensor (vehicles with ABS).
11. If necessary, unscrew bolt 6 of the hub mounting.
Warning! The rear wheel hub bearing unit must not be disassembled. No damage or scratches are allowed on the teeth of the wheel speed sensor rotor. Do not drop the rotor. If a part of the tooth breaks off as a result of rotor deformation, this will lead to the impossibility of correctly determining the wheel speed and disruption of the ABS system as a whole.
Examination
1. Check the hub seal for cracks and damage.
2. Check the hub bearings for wear or damage.
3. Check for chips on the teeth of the wheel speed sensor rotor.
Installation
Installation is carried out in the reverse order of removal, taking into account the following.
1. Temporarily install the wheel speed sensor into the sensor bracket.
2. With the caliper and brake disc removed, insert a feeler gauge into the gap between the rotor tooth and the wheel speed sensor pole, adjust the gap to 0.3–0.9 mm, and secure the sensor bracket.
3. Adjust the parking brake (vehicles with rear disc brakes).