Checking Brake Disc Lateral Runout - Porsche 928 - WORKSHOP MANUAL 1977 Workshop Manual

46
Brake - Mechanical
928
Checking brake disc lateral runout
1. Measuring requirements: No tilt play
present at wheel. If required, adjust
wheel bearing clearance of front wheels.
2. Fit adapter plate (Special Toot 9510/l) to
wheel hub. Tightening torque of wheel
nuts (mounting nuts): 130 Nm.
1035-46
3. Engage dial gauge holder, e.g. Ate Part
No. 03.9314.5500.3101, into brake caliper,
determine center position and fit by turning
the wing screw.
Notes
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 required).
Four-piston fixed caliper brake: Make
sure the spreader spring locating lug at
the mounting plate of the fixed caliper is
not damaged when the dial gauge holder
is fitted in place.
Floating caliper and sliding caliper disc
brake:
To fit the dial gauge holder, the brake pads
must be removed.
4. Fit dial gauge with a slight preload. Place
measuring pointer on maximum diameter of
braking surface.
/
5. Rotate brake disc and read off runout on
dial gauge.
Max. permissible runout of fittecl brake disc
max. 0.1 mm.
Runout of removed
brake disc : max. 0.05 mm.
Runout of wheel hub : max. 0.05 mm.
6. If the brake disc runout exceeds 0.1 mm,
remove the brake disc and check runout of
the wheel hub. Mark position of disc with
regard to wheel hub.
46 - 16 Checking brake disc lateral runout
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PrInted I" Germany - XXIX, 1992