GMC 4000 Series Service Manual page 175

S 5A
g c
Page 168_______________________
HYDRAULIC BRAKES
2 3
1 Clutch Pedal
Shaft Lever
2 Clamp Bolt and Nut
3 Bushings
4 Bolt
5 Pedal Sleeve
6 Lock Washer
7 Nut
Figure 9 — Clutch and Brake Pedal Installation (E4500, 5 5 0 0 , 6 5 0 0 and S 55 0 0 , 6 5 0 0 )
pedal mounted in a bracket which is secured on
the underside of the instrument panel.
As indicated on figures 8 and 9, the brake
pedal pivots on the outside of sleeve, and clutch
pedal shaft extends through inside of sleeve. Nylon
bushings are installed in each end of brake pedal
tube, forming the contact between pedal tube and
pedal sleeve. Clutch pedal shaft is carried in nylon
bushings installed in each end of sleeve. The brake
master cylinder is mounted on the engine side of
the dash (double barrei on some models, single
barrel on others). Adjustable push rods, extending
through dash into master cylinder bores, are at­
tached by special bolts to brake pedal lever and
to clutch pedal shaft lever (on models with hy­
draulic clutch controls).
In released position, each pedal is held against
a rubber bumper by pedal return springs. The fol­
lowing pedal replacement procedures cover both
clutch and brake pedals.
PEDAL REMOVAL (Figs. 8 and 9)
In order to remove the brake pedal, the clutch
pedal must also be removed.
1. Remove bolts attaching brake and clutch
master cylinder push rods to pedal levers.
2. Unhook pedal return springs.
3. Loosen clamp bolt securing clutch pedal
shaft lever on end of clutch pedal shaft and remove
lever from shaft. Remove spring washer, bushings,
and clutch pedal and shaft from sleeve.
4. Remove bolt attaching pedal sleeve to
G M C S E R V I C E M A N U A L
10
panel-to-dash brace. Remove sleeve from brace,
at the same time removing brake pedal and bush­
ings.
PEDAL INSTALLATION
brake pedal and in pedal sleeve for evidence of
wear or deterioration. Bushings are split type and
can easily be removed and replaced.
brake pedal at underside of instrument panel-to-
dash brace. Insert pedal sleeve through brace and
pedal and attach sleeve to brace with bolt and nut.
pedal shaft through sleeve and install spring wash­
er and pedal shaft lever on end of shaft. Tighten
lever clamp bolt firm ly.
and clutch pedals, using special shoulder bolts,
lock washers, and nuts. Tighten nuts to 25-30foot­
pounds torque.
clearance as directed under "PushRodAdjustment."
REMOVAL
models, it is necessary to first remove the clutch
3 11
8 Pedal Return Spring
9 Pedal Support Bracket
Pedal Bumper
10
Spring Washer
11
Clutch Pedal and Shaft
12
13 Brake Pedal Assembly
14
Bolt
15 Push Rod
Before installing pedals, check bushings in
1. Install bushings in pedal tube. Position
2. Install bushings in sleeve. Insert clutch
3. Connect pedal return springs.
4. Connect master cylinder push rods to brake
5. Adjust push rod to provide rod to piston
BRAKE PEDAL REPLACEMENT
(TILT CAB)
(Refer to Figure 10)
In order to remove the brake pedal on tilt cab
T - 3 4 0 8