Measuring Front Brake Disc - Lateral Runout (Wheel Hub)

Information 

The front face of the wheel hub must not be corroded.

The front face of the wheel hub must be cleaned using a fine emery cloth if necessary.

1. Measure lateral runout of the wheel hub.
   1. 1.1 > 9510/1 - Adapter plate-2-  must be fitted on the wheel hub. Then, screw in and tighten wheel bolts.

      > Tightening torque 160 Nm (118 ftlb.) 

   2. 1.2  Secure dial gauge with ball joint arm from > Nr.147-1 - dial gauge set with ball joint arm  at a suitable position on the wheel suspension.
   3. 1.3  Adjust dial gauge from > Nr.147-1 - dial gauge set with ball joint arm  so that the dial gauge is touching the outer edge of the wheel hub with slight preload.
   4. 1.4  Set dial gauge -1-  from > Nr.147-1 - dial gauge set with ball joint arm  to zero, turn the wheel hub at the > 9510/1 - adapter plate-2-  slowly by one full turn and check the deflection of the dial gauge -1-  .

      Courtesy of PORSCHE CARS NORTH AMERICA, INC.

      Dial gauge on wheel hub

2. If the lateral runout of the wheel hub is not within the tolerance range:

   Replace wheel hub.

   405755 REPLACING FRONT WHEEL BEARING

   Maximum lateral runout of the wheel hub: > Measured value 0.03 mm 

3. Only  if the lateral runout of the brake disc is not within the tolerance range, but the lateral runout of the wheel hub is within the tolerance range:

   Replace front brake disc.

   465019 REMOVING AND INSTALLING FRONT BRAKE DISC