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Checking for lateral run-out and variation in thickness, front wheels

Checking for lateral run-out and variation in thickness, front wheels


1. Raise the car and remove the front wheels.

2. Start by control measuring on one side.

3. Press in the piston

- Levels 1, 2 and 4: Prise against the brake pad with a screwdriver.


- Level 3: Prise between the brake disc and the brake caliper using a screwdriver.


4. Remove the brake caliper retaining bolts and lift of the caliper.

Note

Make sure the cable to the wheel sensor is not damaged.


5. Suspend the caliper with cable ties.


6. Fit the five wheel bolts with one washer, part no. 80 73 124, on each.


7. Fit 89 96 639 Gauge, brake disc to the upper mounting lug for the brake caliper with an M10 bolt and nut. Fit a 78 40 622 Dial gauge on either side.

8. Rotate the brake disc while observing the outboard dial gauge. Zero both gauges when the negative reading obtained on the outboard one is at maximum.


9. Rotate the disc and read the gauges. Note the runout (A) and variation in thickness (B).

10. Check that the readings are within specified intervals, see Brakes - Footbrake system - Technical data - Brake discs.

11. Remove the dial gauges, brake disc measuring tool and wheel studs with washers.

12. If runout and thickness variation exceeds specified tolerances, the discs must be machined or replaced. see Brake disc, front .

13. Fit the brake caliper. Secure the bolts with 74 96 268 Thread locking adhesive .

Tightening torque: 210 Nm +30° (155 lbf ft +30°)


14. Fit the wheel

15. Repeat this method of measurement on the other brake disc.

16. Lower the car and depress the brake pedal to press out the brake pads.