Pontiac FIREBIRD 1972 Service Manual page 508

DISC BRAKES 5E- 13
BOLTS
(TORQUE T O 35 LB. FT.)
STEERING
BRAKE CALIPER ASSY.
WITH S.A.E. 30 ENGINE
OIL 8 WIPE OFF EXCESS OIL)
BEARING ASSY.-INNER
DUST CAP
HUB 8 DISC ASSY.
(SEE FRONT WHEEL
BEARING ADJUSTMENT)
Fig. 5E-17 Installation of Steering Knuckle Hub and Disc Assembly
-
A and G Series
5. Depress brake pedal several times to seat linings on
rotor.
7
WARNING: DO NOT MOVE CAR UNTIL A FIRM
BRAKE PEDAL IS OBTAINED.
To check lateral runout (Fig. 5E-19) first adjust the wheel
bearings until all of the end play is eliminated. Fasten a
dial indicator to some portion of the suspension so the
stylus contacts the rotor face approximately one inch from
the rotor edge. Set the dial at zero. Move the rotor one
complete rotation, checking the indicator as the rotor
moves.
ROTOR
INSPECTION
(CHECK ROTORS ONLY WHEN A SPECIFIC COM-
PLAINT POINTS TOWARD A PROBLEM IN THIS
AREA.)
LATERAL RUNOUT CHECK
Lateral runout is the movement of the rotor from side to
side as it rotates. This could be described as "rotor wob-
ble" and causes the piston to seat back into its bore.
NOTE: Runout must be checked on car or on
bench
-
mounted spindle. Do not check runout
on disc turning lathe.
For lateral runout specifications see
-
SPECIFICA-
TIONS.
PARALLELISM CHECK (THICKNESS VARIATION)
Parallelism is the measurement of the variations in thick-
ness of the rotor at several points around the circumfer-
ence of the rotor. Measurements must be made at the same
distance from the edge of the rotor and an indicator which
reads .0001" must be used (Fig. 5E-20). An acceptable,
but less preferable, method would be to use a micrometer