Chevrolet Light Duty Truck 1973 Service Manual page 314

5 -4 8 BRAKES
Fig. 84 -Positioning Actuator Lever
the edge of the flange plate at the points shown in
Figure 83. To center the shoes, tap the upper or
lower end of the shoes with a plastic mallet until
the distances at each end become equal.
10. Locate the adjusting lever .020" to .039" above the
outside diameter of the adjusting screw thread by
loosening the cap screw and turning the adjusting
cam.
NOTE: To determine .020" to .039", turn the
adjusting screw full turns out from the fully
2
retracted position. Hold a .060" plug gauge
(from J-9789-01 Universal Carburetor Gauge
Set) at a 90° angle with the star wheel edge of
the actuating lever. Turn the adjusting cam
until the actuating lever and threaded area
on the adjusting screw just touch the gauge
(figs. 84 and 85).
INSPECTION
At a reasonably frequent interval, the brake system
should be inspected for pedal reserve, which is the
clearance between the pedal pad and the fioorpan.
Inspection should be made with the brake pedal firmly
depressed while the brakes are cold. Pedal reserve on
manual brake vehicles is usually not less than 2-1/4". On
power brake-equipped vehicles, the pedal reserve is
usually not less than - /
1 1 2
NOTE: Heat generated by high speed stops
D IA G N O S IS
".
ACTUATING LEVER---------►
TOP VIEW
ACTUATING LEVER
END VIEW
Fig. 85-Pull Gauge Positioning for Correct Actuator
Lever Adjustment
11. Secure the adjusting cam cap screw and retract the
adjusting screw.
12. Install brake drums and wheels and remove vehicle
from jack stands.
13. Adjust the brakes by making several forward and
reverse stops until a satisfactory brake pedal height
results.
will expand brake drums and increase shoe
clearance, thereby permitting the pedal pad
to go closer to the fioorpan than when the
brakes are cold.
Brake shoe linings should not be permitted to wear down
until rivets or shoes contact drums because the drums
could be scored. As the vehicle mileage approaches the
point where relining may be required it is advisable to
remove one or more drums for inspection of linings in
order to avoid the possibility of damaging brake drums.
LIGHT DUTY TRUCK SERVICE MAmJAL