Checking lateral runout (brake disc/wheel hub) and thickness tolerance

NOTE: Fasten dial gauge set with ball joint arm to wheel bearing housing.

For checking lateral runout two adapters are used. The brake disc and wheel hub can be measured with these.

Brake disc lateral runout

Fig 1: Adapter plate on wheel hub

Courtesy of PORSCHE OF NORTH AMERICA, INC.

1. Remove the wheel. Refer to 44 05 19 Removing and installing wheel - as of MY 2003 (All Models) . and fit the adapter plate P 9510/1 with tightening torque 160 Nm (118 ftlb.).

Fig 2: Dial gauge on brake disc

Courtesy of PORSCHE OF NORTH AMERICA, INC.

2. Fit the adapter dial gauge set with ball joint arm NR.147-1 at a suitable position on the wheel bearing housing.

3. Fit the dial gauge with some preload and measure the lateral runout at the greatest external diameter of the brake disc.

Wheel hub lateral runout

NOTE: The front face of the wheel hub must not be corroded. If necessary, clean with fine emery cloth.

- Measure the wheel hub lateral runout at the front face of the wheel hub. You should always measure the external and internal diameters of the wheel bolt area.

1. Remove the brake disc. Refer to 465019 Removing and installing the front brake disc [9PAAD1 9PAAD7 9PAAE1 9PAAE7 9PAAF1 9PAAJ1]

Fig 3: Dial gauge on wheel hub

Courtesy of PORSCHE OF NORTH AMERICA, INC.

2. Fit the adapter dial gauge set with ball joint arm NR.147-1 at a suitable position on the wheel bearing housing. Fit the dial gauge with some preload.

Brake disc thickness tolerance

- Brake disc thickness tolerance max. 0.01 mm.

- Measure the thickness tolerance with a suitable micrometer screw within the braking surface at approx. eight points.