Checking for lateral runout andvariation in thickness
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Checking for lateral runout and
variation in thickness
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1.
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Lift the car and remove the front
wheels.
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2.
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Start performing the check measurement on one side. Press in the brake piston
using a pair of grips.
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3.
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Remove the brake caliper and bind it to the spring strut using a cable tie.
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4.
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Fit the five wheel studs with the four washers on each wheel studs. The washers
have part no. 80 73 124.
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5.
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Fit the measuring clamp on the lower securing lug for the brake caliper. Secure
the measuring dials. The measuring dials have part no. 78 40 622.
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6.
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Rotate the brake disc and at the same time watch the outer measuring
dial. Reset both dials when the outer shows the maximum negative effect.
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7.
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Rotate the disc and read of the dials. Note the runout (A) and the variation in
thickness (B).
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8.
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Remove the dials, measuring clamp and wheel studs with washers.
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9.
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Fit the brake caliper, lock the stud threads with Locktite and tighten.
Tightening torque 80 Nm (59 lbf ft)
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10.
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Fit the wheels and tighten the wheel studs.
Tightening torque
- light alloy wheels 117 Nm (86.6 lbf ft)
- pressed steel wheels 100 Nm (74 lbf ft)
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11.
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Repeat this method of measurement on the other front wheel.
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12.
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When the measurements have been completed, lower the car and press the
brake pedal to press out the brake pads.
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