Initial Inspection and Diagnostic Overview

Brake discs - Measurement sheet








Remarks on measurement sheet

- In order for measured results to be documented, however, a copy of the alignment card shown above can be used. In practice this means that alignment cards cannot be ordered!
- The alignment cards can be used for all 911 Carrera (996) and the 911 GT3 (996)!

1. Prepare copies of the corresponding alignment card shown.
2. Before measurement (test 1 through test 3), enter the general data, vehicle type (for example 911 Carrera 4S) and the missing nominal values (new brake disc thickness / brake disc wear limit) into the copied alignment card.

Information
- Actual values that are identical in all designs have already been entered!

3. Carry out measurements (actual status) and enter the values in the alignment card.
4. If brake discs are to be replaced, carry out Test 2, with the new discs again and enter the current values in a new alignment card.

Measuring prerequisites / Measuring points

Observe working position numbers!

Measuring brake discs: 80 time units per axle!

Test 1 (brake disc thickness)





- Measure the brake disc thickness -X- in the area of the outer or inner friction surface traces -arrows-, at 3 measuring points (each offset by 120°) -A / B / C-. To do this, use a suitable micrometer screw or a brake disc gauge (drawing shows a GT2 brake disc).

Test 2 (lateral runout)





- Mount the adapter plate 9510/1 -arrow- on the wheel hub. Tightening torque of the wheel bolts (fastening screws): 130 Nm (96 ftlb.).
- Secure the dial gauge with some preload. The measuring range is on the largest diameter of the braking surface.





- 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.

Test 3 (brake disc thickness tolerance)

- Measure the brake disc thickness deviation within the brake surface at approx. 8 points by using the micrometer. Thickness tolerance of the brake disc max. 0.02 mm (new condition: max. 0.01 mm).