911 Carrera 4 Cabriolet (996) F6-3.6L (2003)
Brake Rotor/Disc: Testing and Inspection
Front Brake Disc Lateral Runout
Measuring the front brake disc lateral runout
Includes: Measuring the brake disc thickness tolerance
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 Nm (96 ftlb.).
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.
Information
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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.
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.
Information
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Do not damage the brake hoses or brake lines during removal/installation of the brake caliper.