Checking Lateral Runout (Brake Disc/Wheel Hub) And Thickness Tolerance

WARNING: This page is about a different variant/trim than selected.

Information

Secure dial gauge set with ball joint arm to wheel bearing housing.

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

Brake disc lateral runout

Remove the wheel
> 440519 REMOVING AND INSTALLING WHEEL

and fit the > 9510/1 - adapter plate with tightening torque 160 Nm (118 ftlb.).

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

Adapter plate on wheel hub
Fit the adapter > Nr.147-1 - dial gauge set with ball joint arm at a suitable position on the wheel bearing housing.

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

Dial gauge on brake disc
Fit the dial gauge with slight preload and measure the lateral runout at the greatest external diameter of the brake disc.

Wheel hub lateral runout

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.

Information

The front face of the wheel hub must not be corroded and must be cleaned if necessary using a polishing cloth.

Remove brake disc.
>465019 REMOVING AND INSTALLING FRONT BRAKE DISC
Fit the adapter > Nr.147-1 - dial gauge set with ball joint arm at a suitable position on the wheel bearing housing. Fit the dial gauge with slight preload.

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

Dial gauge on wheel hub

Brake disc thickness tolerance

For details of brake disc thickness tolerance, see Technical data/brake wear limits.

>4650TW TECHNICAL DATA/BRAKE WEAR LIMITS

Measure the thickness tolerance using a suitable micrometer screw at approx. 8 places within the braking surface.