Measuring lateral runout of

Concerns: Measuring thickness tolerance of brake discs

1. Measuring requirements: No tilt play of the wheel.

2. Fit adapter plate (Special Tool 9510/1) to wheel hub. Tightening torque of wheel nuts (mounting nuts) is 130 Nm (96 ftlb.).

front brake discs

If required, fit dial gauge holder with Ate conversion kit, Part No. 03.9314-5510.3/01 (longer wing screw and bracket for dial gauge if necessary).

4. Fit dial gauge with a slight preload. Place measuring pointer on largest diameter of brake surface outside of perforation.


5. Rotate brake disc and read off runout on dial gauge.

Max. permissible lateral runout of fitted brake disc: 0.09 mm.

Lateral runout of removed brake disc: max. 0.05 mm

Lateral runout of wheel hub: max. 0.04 mm,

3. Engage dial gauge holder, e.g. Ate Part No 03.9314-5500.3/01, into the brake caliper, center out and mount by turning the wing screw.

Retract brake pads somewhat if the brake disc cannot be rotated freely. Do not damage lug for cross spring at the retaining plate of the four-piston fixed calipers when fitting the dial gauge holder.

6. If the lateral runout of the brake disc exceeds 0.09 mm, remove the brake disc and check lateral runout of wheel hub. Before dismantling, mark position of disc on wheel

7. Check runout of wheel hub as follows: Measure once outside (arrow) and once inside wheel stud area (5-point measuring process) of hub face.

To fit the dial gauge, use either a universal dial gauge holder, e.g. by SNAP - ON (Part No. PMF 137), or a modified (extended) dial gauge holder - VW 387.

Dial Runout Gauge
1039 - 46


Make sure the brake hoses and brake pipes are not damaged when the brake caliper is

The above SNAP-ON Part No. PMF 137 is applicable to a complete dial gauge set as the dial gauge holder is not available separately. The dial gauge set may also be used to check the brake disc lateral runout.

1984 Porsche 911 Gauge Wiring Pictures


8. Excessive lateral runout of wheel hub:

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