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 (1)
Remove front wheel (para. 6-76).
6-38.
BRAKE PEDAL.
(2) With brake spring pliers, remove
a.
Removal.
brakeshoe return spring (27, figure 7-35) and retainer
(1) Remove floor plate (para.
627) from
spring (28). Carefully remove brakeshoes and install
truck.
brake clamps on wheel cylinder to prevent pistons being
pushed out of cylinder by residual pressure in brake
(2) Remove cotter pin (17, figure 7-29) and
lines.
clevis pin (16) from push rod (34). Disconnect spring(5)
from brake pedal.
d.
Brakeshoe Installation
(3) Remove screw (19), nut (20) and
(1)
Reverse procedure in c.(2) above.
lockwasher (21) attaching brake pedal and remove
pedal from truck.
(2)
Install front wheels (para. 6-76).
b. Installation and Adjustment.
Reverse
e. Service Brake Adjustment. Brake lining-to-
procedures in a. above and check for proper pedal
drum clearance on the wheel brakes is self-adjusting.
adjustment (para. 6-37b.(4).
Each application of the brake pedal sets the automatic
6-39.
HOURMETER.
adjustment to compensate for brake lining wear. No
further adjustment is required during the life of the brake
a.
Removal.
linings. The only adjustment in the hydraulic brake
(1) Disconnect two leads at hourmeter from
system is for brake pedal free play (para. 6-37b-4).
under instrument panel, tape ends and tag leads for
identification.
6-37.
MASTER CYLINDER.
a.
Removal.
(2) Remove two nuts holding hourmeter to
(1) Remove floor plate (para. 6-27).
instrument panel and lift hourmeter off panel.
(2) Remove bolt connector (28, figure 7-29)
b.
Installation. Reverse procedures in a. above.
and brake line fitting (30) from front of master cylinder
6-40.
LIGHT SWITCH.
along with gaskets (29, 31). Take precautions to keep
dirt from entering brake line.
a.
Removal.
(1) Remove nut at top of light switch and
(3) Remove nuts, lockwashers and screws
lower switch out bottom of instrument panel.
(25, 26, 27, figure 7-29) attaching master cylinder to
truck, and remove master cylinder. Push rod will remain
(2)
Disconnect, tape and tag leads from
connected to brake shaft and need not be removed.
switch.
b.
Installation.
b.
Installation. Reverse procedures in a. above.
6-41.
PANIC SWITCH.
(1)
Reverse procedures in a. above.
a.
Removal.
(2)
Fill cylinder with hydraulic brake fluid.
(1) Pull button off panic switch, unscrew
knurled retaining nut at top of switch and lower switch
(3)
Bleed brake hydraulic system (para.
6-
out bottom of instrument panel.
36b.).
(2)
Disconnect, tape and tag leads from
(4) Loosen jamnut (15, figure 7-29) on push
switch.
rod and adjust length of push rod by turning adjustment
to give 1/4-inch to 5/8-inch free travel of pedal before
b.
Installation. Reverse procedures in a. above.
brake application begins. Tighten jamnut to secure
adjustment.
6-18
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