Pontiac FIREBIRD 1972 Service Manual page 511

5E-16 1972 PONTIAC SERVICE MANUAL
After machining; surface refinishing with rotary grinder is
manditory to impart the proper non-directional micro-
finish.
After machining, measure rotor for parallelism, runout,
and thickness as outlined above.
WARNING: UNDER NO CIRCUMSTANCES
SHOULD ROTORS BE MACHINED BELOW MINI-
M U M THICKNESS OF .98" (A, X, F AND G SE-
RIES) OR 1.23" (B SERIES). THICKNESS MUST
BE MEASURED BEFORE AND AFTER TURNING
SINCE PRODUCTION ROTORS ARE NOT ALL
BUILT TO ONE THICKNESS.
THE STAMPED FIGURE ON THE ROTOR IS IN-
TENDED AS A "DISCARD" DIMENSION ONLY.
UNDER NO CIRCUMSTANCES SHOULD A RO-
TOR BE MACHINED TO THIS DIMENSION.
COhilBINATION VALVE
REMOVAL A N D INSTALLATION
The Combination Valve (Fig. 5E-25) is not repairable and
is, therefore, serviced only as a complete assembly.
1. Disconnect hydraulic brake lines from the combina-
tion valve. Cover or plug open lines with clean, lint
free material to prevent entrance of foreign matter or
loss of fluid.
2. Disconnect wire from switch terminal.
3. Remove two screws retaining combination valve to
the frame (A, B and G Series) or mounting bracket
below the master cylinder (F and X Series) and
remove valve.
4. To install reverse the above procedure.
5. Bleed entire brake system following the procedure
described under BLEEDING DISC BRAKES.
SPECIFICATIONS
Disc Brake Type
..............
Fixed Rotor, Sliding Caliper
Location
..........................................
Front Wheels Only
Rotor Type
....................................
Ventilated-Cast Iron
Rotor Diameter
......................................
B Series-1 1.75"
..................
A, X, F and G Series- 1 1 "
Rotor Runout (Maximum).
.........................
.004" -Total
Rotor Surface Finish
........................
20-60 Micro-Inch
........
(w/Non-Directional Lay)
Rotor Thickness (New)
B Series
..................................................
Up to 1.285"
A, F, X and G Series
............................
Up to 1.035"
Rotor Thickness (Minumum)
BSeries
............................................................
1.215"
A, F and G Series
.............................................
.965"
X Series
............................................................
.980"
Rotor Parallelism (Thickness Variation)
....
.0007" max.
Rotor Parallelism (Thickness Variation) X Series
.0005" Max.
Brake Shoe and Lining Type
............................
Riveted
Brake Shoe and Lining Thickness (New)
..................................................................
Inner .635"
Outer
..................................................................
S45"
Brake Lining Minimum
.........................
Thickness Before Replacement .125"
Master Cylinder Diameter
..................................
1.125"
TORQUE SPECIFICATIONS
APPLICATION TORQUE
Bolt-Caliper to Mounting Bracket or Bolt
-
Splash Shield to Steering Knuckle (Upper)
..........................................
Steering Knuckle 35 lb. ft. B and F Series Vehicles
..............................
15 lb. ft.
Bolt-Splash Shield and Mounting Bracket Bracket to Knuckle (Lower) A, G and X Series
to Knuckle (Upper) Except B and F Series Vehicles Vehicles
............................................
80 lb. ft.
115 1b. ft. Screw-Caliper Bleeder
......................................
65 lb. in.
Bolt and Nut-Splash Shield and Mounting