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

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

1. Removing wheel.

   > 440519 REMOVING AND INSTALLING WHEEL - on "Removing"

2. > 9510/1 - Adapter plate  must be fitted and tightened to tightening torque 160 Nm (118 ftlb.). > Adapter plate on wheel hub 

   Courtesy of PORSCHE CARS NORTH AMERICA, INC.

   Adapter plate on wheel hub

3. Fit adapter > Nr.147-1 - dial gauge set with ball joint arm  at a suitable position on the wheel bearing housing. > Dial gauge on brake disc 

   Courtesy of PORSCHE CARS NORTH AMERICA, INC.

   Dial gauge on brake disc

   Information 

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

4. Fit dial gauge with slight pretension 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.

1. Removing brake disc front.

   > 465019 REMOVING AND INSTALLING FRONT BRAKE DISC  - on "Removing"

2. Fit 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. > Dial gauge on wheel hub 

   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.

   > 4600TW TECHNICAL VALUES - GREY CAST-IRON BRAKES 

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