Parking Brake Cable; Combination Value; Brake Pedal - Chevrolet LIGHT DUTY TRUCK (SERIES 10-35) Service Manual

enough to overcome spring tension. Adjust clevis of pull rod
or front cable to line up with hole in relay levers.
a. Insert clevis pin and cotter pin, then tighten clevis
locknut.
b. Install a new
metal
contamination of brake.
c. Lower rear wheels. Remove jack and wheel blocks.
CAUTION: See "Caution" on Page 1 of
this section.
Adjustment-Drum Off
1. With parking brake drum off, use special Tool J-
21177 or J-22364, Drum to Brake Shoe Clearance Gauge,
to check diameter of drum clearance surface.
2. Turn the tool to the opposite side and fit over brake
shoes by turning the star wheel until the gauge just slides
over the linings.
3. Rotate the gauge around the brake shoe lining
surface to insure proper clearance.
4. Install propeller shaft flange at mainshaft as outlined
in transmission section.
5. Lower rear wheels. Remove jack and wheel blocks.
PARKING BRAKE CABLES
Front Parking Brake Cable Replacement
1. Raise vehicle on hoist.
2. Remove adjusting nut from equalizer.
3. Remove retainer clip from rear portion of front cable
at frame and from lever arm.
4. Disconnect front brake cable from parking brake
pedal or lever assemblies. Remove front brake cable. On
some models it may assist installation of new cable if a heavy
cord is tied to other end of cable in order to guide new cable
through proper routing.
5. Install cable by reversing removal procedure.
6 . Adjust parking brake.
Center Parking Brake Cable Replacement
1. Raise vehicle on hoist.
2. Remove adjusting nut from equalizer.
3. Unhook connector at each end and disengage hooks
and guides.
4. Install new cable by reversing removal procedure.
5. Adjust parking brake.
6 . Apply parking brake 3 times with heavy pressure and
repeat adjustment.
Rear Parking Brake Cable Replacement
1. Raise vehicle on hoist.
2. Remove rear wheel and brake drum.
3. Loosen adjusting nut at equalizer.
4. Disengage rear cable at connector.
5. Bend retainer fingers.
6 . Disengage cable at brake shoe operating lever.
7. Install new cable by reversing removal procedure.
8 . Adjust parking brake.
hole cover in drum to prevent
COMBINATION VALVE
Testing Electrical Circuit of Combination Valve
1. Disconnect wire from switch terminal and use a
jumper to connect wire to a good ground.
2. Turn ignition key on "On" - warning lamp should
light. If lamp does not light, bulb is burned out or electrical
circuit is defective. Replace bulb or repair electrical circuit
as necessary.
3. When warning lamp lights, turn ignition switch off.
Disconnect jumper and reconnect wire to switch terminal.
Testing Warning Light Switch Portion of
Combination Valve
1. Raise vehicle on hoist. Attach a bleeder hose to a
rear brake bleed screw and immerse the other end of the
hose in a container partially filled with clean brake fluid.
Be sure master cylinder reservoir is full.
2. Turn ignition switch to "On"; open bleeder screw
while a helper applies moderate pressure to the brake pedal;
warning lamp should light. Close bleeder screw before
helper releases brake pedal. Reapply brake pedal with
moderate-to-heavy pressure; light should go out.
3. Attach the bleeder hose to a front brake bleeder
screw and repeat above test. Warning lamp action should
be the same as in Step No. 2. Turn ignition switch off.
4. If warning lamp does not light during Steps 2 and
3 but does light when a jumper is connected to ground, the
warning light switch portion of the combination valve is
defective. Do not attempt to disassemble the combination
valve. If any portion of the combination valve is defective,
it must be replaced with a new combination valve.
5. Lower vehicle to floor. Check and refill master
cylinder to proper level.
Replacement
The combination valve is not repairable and must be
serviced as a complete assembly.
1 . Disconnect hydraulic lines at combination valve.
Plug lines to prevent loss of fluid and entrance of dirt.
Disconnect warning switch wiring harness from valve
switch terminal.
2. Remove combination valve.
3. Install combination valve by reversing removal steps.
4. Bleed entire brake system. Do not move vehicle until
a firm brake pedal is obtained.

BRAKE PEDAL

The brake pedal mounting is an integral
NOTICE:
design with the cluth
transmission), necessitating the removal of the clutch
pedal before removing the brake pedal.
Removal (Fig. 5-1 2)
1. Remove the pull back spring from the body or brake
pedal support bracket.
2.
Manual Transmission Vehicles--
clutch pedal as outlined under "Clutch Pedal" in Section
1C.
Automatic Transmission Vehicles--
pedal pivot bolt nut or pivot pin retainer and remove bolts
or pin and bushings.
3. P Models-- Remove the sleeve assembly screw
BRAKES 5-23
pedal (except automatic
Remove the
Remove
LIGHT T R U CK SER V IC E MANUAL