Master Cylinders - GMC 4000 Series Service Manual

Figure 10— Brake Pedal and Master Cylinder Installation (Tilt Cab Models)
pedal assembly to obtain enough clearance to re­
move brake pedal.
1. Remove clutch pedal (for details see "Clutch
Pedal and Bushing Replacement" in "CLUTCH CON­
TROLS" (SEC. 7D) of this manual.
2. Remove upper to lower pedal connector
bolt. Remove pedal upper half.
3. Remove pedal return spring.
4. Remove pedal to push rod bolt.
5. Remove lock ring and washer from outside
end of pin and bushing assem bly.
6. Remove grease fitting from bushing.
7. Remove bolts which fasten bushing assem ­
bly to cab sill.
8. Simultaneously slide pedal assembly and
bushing assembly out of cab sill in opposite direc­
tions, twisting each as necessary to clear sill and
other obstructions.
INSTALLATION
1. Simultaneously insert bushing assembly
from outer side of cab sill and brake pedal assem ­
bly from inner side of cab sill, twisting each as
necessary to allow pedal pin to slide completely
through bushing and bushing assembly to slide
completely through cab sill.
2. Install bolts which fasten bushing assembly
to cab sill. Tighten securely.
3. Install grease fitting.
4. Install washer and lock ring on outside end
G M C S E R V I C E M A N U A L
1 Pedal Upper Half
2 Pedal Upper and Lower
Seals
3 Upper to Lower Pedal
Connector Bolt
4 Pedal Lower Half
5 Pedal Return Spring
6 Pedal Bumper
7 Pedal Support Sill
8 Pin and Bushing Assy.
of pin and bushing assembly.
fasten upper and lower pedal halves with bolt.
Pedal andBushing Replacement" in "CLUTCH CON­
TROLS" (SEC. 7D) of this manual).
varies according to model. The amount of free
play and the location for measuring free play dif­
fers, dependent on vehicle model and type of equip­
ment used.
models and tolerances given should be adhered to.
If the push rod is too long, brakes will not release
completely. If the push rod is too short excessive
pedal travel will be required to apply the brakes.
push rod adjustment, always remember it is better
to have push rod adjusted too short than for it to be
too long.
TILT CAB MODELS (Refer to Fig. 10)
HYDRAULIC BRAKES
9 Pedal to Push Rod Bolt
10 Clevis
11 Adjusting Nut
12 Push Rod
13 Boot
14 Mounting Bracket
15 Bracket to Master
Cylinder Gasket
16 Master Cylinder
5. Install pedal to push rod bolt.
6. Install pedal return spring.
7. Insert pedal upper half through seals and
8. Install clutch pedal (for details see "Clutch
PUSH ROD ADJUSTMENT
Instructions covering push rod adjustment
Push rod adjustment is very important on all
IMPORTANT: If any doubt exists relative to
1. Set emergency brake or block wheels.
2. Tilt cab (see instructions in Section 1).
Sec. 5A
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