Checking for lateral run-out and variation in thickness, rear wheels
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Checking for lateral run-out and variation in thickness, rear wheels
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1.
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Raise the car and remove the rear wheels.
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2.
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Start by control measuring on one side.
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3.
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Remove the retaining spring from the brake caliper.
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4.
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Remove the protective covers.
Remove the hydraulic body and suspend it with a hook on the brake pipe holder.
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Note
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Be careful not to damage the brake pipe.
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5.
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Remove the outer brake pad.
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6.
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Remove the brake caliper carrier.
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7.
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Fit the five wheel bolts with one washer, part no. 80 73 124, on each.
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8.
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Mount the brake disc on the lower retaining lug for the brake caliper with an M10 bolt and nut. Fit a
78 40 622 Dial gauge
on each side.
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9.
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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.
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10.
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Rotate the disc and read the gauges. Note the runout (A) and variation in thickness (B).
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11.
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Check that the readings are within specified intervals, see Brakes - Footbrake system - Technical data - Brake discs - Rear.
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12.
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Remove the dial gauges, brake disc measuring tool and wheel studs with washers.
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13.
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If the measured runout and thickness variations are outside the tolerances, see Brakes - Footbrake system - Technical data - Brake discs - Rear, then the discs must be turned or replaced, see
Brake disc, rear
and
Brake disc, rear, 4WD
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14.
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Clean the contact surfaces between the brake caliper carrier and the steering swivel member.
Fit the brake caliper carrier with 74 96 268 Thread locking adhesive.
Tightening torque 130 Nm +45° (96 lbf ft +45°)
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17.
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Fit the hydraulic body.
Tightening torque 28 Nm (21 lbf ft)
Fit the protective covers.
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18.
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Fit the retaining spring to the brake caliper.
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20.
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Repeat this method of measurement on the other brake disc.
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21.
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Lower the car and depress the brake pedal to press out the brake pads.
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