Service Brake Pedal and Linkage

TM 10-3930-628-12

(4) Connect operating rod to pedal and check

travel. Adjust as above if necessary to bring travel within

limits .specified.

Figure 4-16. Service brake pedal adjustment

4-34. Service Brake Master Cylinder

a. Removal.

(1)Refer to figure 4-3 and remove stoplight

REMOVE NUT FROM ROD.

switch and disconnect brake line from master cylinder.

REMOVE SPRING RETAINER AND SPRING

(2)Disconnect operating rod (fig. 4-16) from

FROM ROD

brake pedal.

DISCONNECT LOWER ROD FROM PARKING

(3) Remote mounting screws 112. fig. 4-.11

BRAKE LEVER

and remove master cylinder from truck. Remote switch

Figure 1-15. Parking brake lower linkage. installed view.

(5) and bracket 161 from truck.

(4) Remove operating rod

(8).

spring

4-33.

Service Brake Pedal and Linkage

retainers (13 and 16) and spring (4) from master cylinder

a. General. The service brake pedal (fig. 2-

(,).

21 is connected to the master cylinder by an operating

b. Installation.

rod attached to the cylinder piston push rod. A spring,

(1) Install spring retainers (13 and 1 fig. 4-17

mounted between two retainers on the rod. returns the

spring (14) and operating rod (18) on master cylinder.

pedal to the released position.

Install rod through boot (15).

b. Adjustment. Pedal free play should be ad-

(2) Install master cylinder -switch 15) and

justed to one-half inch of travel to allow master cylinder

bracket (6) on frame support. Secure with mounting

to return to off position and reduce usable length of

screws (12) nuts (10) and washers (11).

stroke. Remove floor and toe plates to gain access to

(3) Connect brake line fig. 4-31 and install

master cylinder and linkage. Refer to figure 4-16 and

stoplight switch in master cylinder.

adjust service brake pedal travel as follows:

(4) Adjust pedal travel (para 4-33) if

(1) Slowly depress brake pedal and check free

necessary

travel. Observe push rod action at master cylinder.

(5) Refer to c. below to fill master cylinder and

(2) If free travel is more or less than one-half

bleed brake hydraulic system.

inch, remove retaining ring and disconnect operating

rod from pedal.

(3) Adjust locknut on operating rod to adjust

travel in direction desired.

4-18