Examination
1. Apply the parking brake, jack up the front of the vehicle and support it securely on jack stands (see "Jacking up the car and placing it on stands"). Remove the relevant wheel.
2. Using metal bushings, install the two wheel bolts on opposite sides and tighten securely.
3. Remove the grease cap from the center of the hub. If the cap is damaged during removal, it must be replaced. If necessary, remove the radio interference spring from the center of the shaft axis.
4. Using a large flat head screwdriver, carefully pry the brake pads away from the disc so that they do not interfere with the movement of the hub bearing.
5. Attach a dial micrometer to the front face of the hub/disc and position the gauge probe so that it touches the end of the axle shaft. Set the scale to zero, then grasp the disc at two opposite points and pull the disc (see fig. 2.5). Determine indications of a micrometer, and compare a backlash in the bearing of a nave with the value specified in section Technical data at the beginning of this Chapter. If the value is out of range, adjust the bearing as described in the appropriate subsection below.
Pic. 2.5. Using a dial micrometer to check and adjust the clearance in the hub bearing
6. If the gap is normal, remove the micrometer, then install the radio interference spring (where it is installed) and hammer the oil cap into place. Install the wheel. then lower the vehicle to the ground and tighten the wheel bolts to the correct torque. Before driving the vehicle, depress the brake pedal several times to return the pedal pressure to its previous state.
Adjustment
7. If not already done, follow the steps described in p.p. 1-4.
8. Loosen the pinch bolt of the hub nut so that the nut can be easily turned (see paragraph 3).
9. Rotate the brake disc and lightly tighten the hub nut to make the disc difficult to turn. From this position, loosen the nut about one-third of a turn, then tap the end of the hub axle with a wooden mallet to relieve pressure in the bearing.
10. Check the clearance in the hub bearing as described in step 5. If necessary, adjust the clearance by turning the nut as far as necessary. When the clearance is adjusted, tighten the hub nut pinch bolt to the required torque.
11. Check the clearance in the bearing, then install all removed parts as described in step 6.