Chevrolet 30 Series 1967 Service Manual page 225

Fig. 17—Eccen tric Bolt Adjustment
3. Tighten check nut on eccentric bolt and recheck
movement.
BRAKE PEDAL & PUSH ROD TRAVEL
ADJUSTMENT
A definite pedal push rod-to-main cylinder piston
clearance must be maintained on the dash mounted main
cylinder units. This clearance is adjusted as follows:
Eccentric Bolt Type Adjustment
Refer to Figure 17.
1. After the brake pedal and pedal bumper have been
assembled, install the eccentric bolt with the pro­
jection on the head in top or bottom position. Then
Fig . 18—Brake Pedal Free Movement
FW D
*
Fig. 19—Parking Brake Adjustment
to obtain the correct clearance between the push rod
and the m aster cylinder, rotate the eccentric bolt so
that the free pedal travel measured at the center of
the pedal pad is approximately
2. After tightening the nut on the eccentric bolt to 40-50
ft. lbs. torque, recheck free travel.
3. Stop light switch should be adjusted if necessary, so
that the electrical contact is made at approximately
13/16 inch pedal pad travel.
Threaded Rod Type Adjustment
1. After the brake pedal and pedal bumper have been
assembled, install the push rod and its attaching
parts. Tighten nut to 40-50 ft. lbs. torque. Then to
obtain the correct clearance between the push rod
and the master cylinder, adjust the push rod so that
the free pedal travel measured at the center of the
pedal pad is approximately
2. After tightening the locknut on the adjustable push
rod to 17-23 ft. lbs. torque, recheck free travel.
3. Stop light switch should be adjusted if necessary, so
that electrical contact is made at approximately
13/16 inch pedal pad travel.
PARKING BRAKE ADJUSTMENTS
(Figs. 19, 20, 21, and 22)
Rear Wheel Parking Brake
Adjustment of the cable connected " rear wheel type"
parking brake used on 1/2, 3/4, and 1 ton models must be
performed each time the service brakes are adjusted and
can be accomplished only when service brakes are in
adjustment.
The propeller shaft parking brake used on all other
trucks operates independent of the service brakes and
necessary adjustment of either the " band type" or
" shoe type" is covered in this section.
CA10-20-30 and KA10-20 Models
1. Jack up both rear wheels.
2. Apply parking brake 4 notches from fully released
position.
3. Loosen equalizer check nut and tighten the adjusting
nut until a moderate drag is felt when the rear
wheels are rotated.
4. Tighten the check nut securely.
5. Fully release parking brake and rotate the rear
wheels. No drag should be present.
BRAKES 5-9
inch (fig. 18).
1 / 8
inch (fig. 18).
1 / 8
CHEVROLET TRUCK SERVICE MANUAL