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Includes: Measuring the brake disc thickness tolerance

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  1. Measurement precondition: No tilt play at the wheel.
  2. Fit the adapter plate (special tool 9510/1) to the wheel hub. Tightening torque of the wheel bolts (fastening screws): 130 N.m (96 ftlb.)
    Fig 1: View Of Adapter Plate (Special Tool 9510/1) On Wheel Hub
    G03105854Courtesy of PORSCHE OF NORTH AMERICA, INC.
  3. Insert dial gauge holder, e.g. Ate order No. 03.9314 - 5500.3/01, into the brake caliper, align it and secure it by turning the clamping wing screw. If the brake disc cannot be turned freely, set the brake pads back a little. Do not damage the expanding spring when fitting the dial gauge holder.
    NOTE: If necessary, provide the dial gauge holder with the Ate conversion set, order No. 03.9314 - 5510.3/01 (longer clamping wing screw and, possibly, also a bracket for the dial gauge).
  4. Secure the dial gauge with some preload. Put the measuring tip against the largest diameter of the braking surface.
    Fig 2: Measuring Brake Disc Lateral Runout
    G03105855Courtesy of PORSCHE OF NORTH AMERICA, INC.
  5. Turn the brake disc and, when doing so, read off the lateral runout at the dial gauge. The permissible lateral runout of the installed brake disc is max. 0.06 mm.

    Lateral runout of the removed 

    brake disc: max. 0.03 mm. 

    Wheel hub lateral runout: max. 0.03 mm. 

  6. If the brake disc lateral runout exceeds 0.06 mm, remove the brake disc and check the wheel hub lateral runout. First mark the position with respect to the wheel hub.
  7. Check the wheel hub lateral runout as described below: Measure 1 x outside (arrow) and 1 x inside (arrow) of the wheel bolt area (5-point measuring procedure) on the front face of the wheel hub. Fasten the dial gauge using a commercially available universal dial gauge holder.
    NOTE: Do not damage the brake hoses or brake lines during removal/installation of the brake caliper.

    The universal dial gauge holder can also be used to check the brake disc lateral runout.

    Fig 3: Identifying Inside And Outside Wheel Bolt Area For Checking Wheel Hub Lateral Runout
    G03105856Courtesy of PORSCHE OF NORTH AMERICA, INC.
  8. Wheel hub lateral runout is too large: Replace the wheel hub. Wheel hub lateral runout OK: Clean the levelling and centering surfaces on the brake disc and wheel hub. Next, apply a thin coat of Optimoly TA to the centering surface on the wheel hub. Fasten brake disc on the wheel hub in a different position than before - radially offset with respect to the wheel hub. Repeat measurement with fitted adapter plate - special tool 9510/1. If the lateral runout is still greater than 0.06 mm, replace the brake disc.
    NOTE: If the brake disc lateral runout was reduced by radial offset of the brake disc with respect to the wheel hub, one M 6 screw can be omitted if two M 6 countersunk screws were present.
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