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. Remove wheel.

   > WM, 440519 REMOVING AND FITTING WHEEL "REMOVING "

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

   Courtesy of PORSCHE CARS NORTH AMERICA, INC.

   Adapter plate on wheel hub

3. Fit >VAS 6079/1 - dial gauge holder for brake discs  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

4. Fit dial gauge with slight preload and measure the lateral runout at the largest external diameter of the brake disc.

   Information 

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

5. Wheel hub lateral runout: 
   1. 5.1 Measure the wheel hub lateral runout at the front face of the wheel hub. Measure the external and internal diameter of the wheel bolt area.
   2. 5.2 Remove front brake disc.

      > WM, 465019 REMOVING AND INSTALLING FRONT BRAKE DISC  "REMOVING "

      > WM, 465119 REMOVING AND INSTALLING FRONT PCCB BRAKE DISC  "REMOVING "

6. Fit >VAS 6079/1 - dial gauge holder for brake discs  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

7. Brake disc thickness tolerance: 
   1. 7.1 Brake disc thickness tolerance, see:

      > 4600TW GREY CAST IRON BRAKES - TECHNICAL VALUES AND WEAR LIMITS 

      > 4600TW PCCB - TECHNICAL VALUES AND WEAR LIMITS 

   2. 7.2 Use a suitable micrometer screw to measure the thickness tolerance at 8 points within the braking surface.