BRAKES
5-41
Brake Warning Light Checking
1. Set parking brake and turn the ignition key to
"ON".
2. Warning lamp should light.
3. If lamp does not light, bulb is burned out or
electrical circuit is defective.
4. Turn ignition key off.
5. Replace bulb or repair circuit as necessary.
Testing Warning Switch
1. Raise vehicle on a hoist and attach a bleeder hose
to a rear brake bleed screw and immerse the other
end of hose in a container partially filled with clean
brake fluid. Be sure master cylinder reservoirs are
full.
NOTE: When bleeding the brakes; the pin in
the end of the metering portion of the
combination valve must be held in the open
position (not allowed to close). This can be
accomplished by installing Tool J-23709
under the mounting bolt and depressing the
pin a slight amount. Be sure to re-torque the
mounting bolt after removing Tool J-23709
(fig- 29).
CAUTIO N:
See
"
Caution" on Page 1 of this
section.
2. Turn ignition key "ON". Open bleed screw while
helper applies heavy pressure to brake pedal.
Warning lamp should light. Close bleed screw
before helper releases pedal.
NOTE: To "reset" switch, apply heavy pedal
force. This force will apply hydraulic pressure
which re-centers the switch contact.
3. Attach bleeder hose to front brake bleed screw and
repeat Step 2.
4. Turn ignition key off. See Note under Step 2.
5. Lower vehicle to floor.
NOTE: If warning lamp does not light
during Steps 2 and 3 but does light when the
parking brake is set, warning light switch is
defective. Do not attempt to repair switch. A
defective switch must be replaced with a new
combination valve assembly.
CAUTIO N:
Caution should be taken to prevent
air from entering system during checks on
switch.
The recommended checking interval should be 24
months or 24,000 miles, any time major brake work is
done or any time a customer complains of excessive
pedal travel.
BRAKE TRAVEL WARNING SWITCH (Fig.
74)
Vehicles with frame mounted vacuum over hydraulic
boosters have an electrical switch that senses pedal
travel. This switch will illuminate the lamp on the
instrument panel whenever the brake pedal is in excess
of 5.10 inches.
Removal
1. Loosen the nut (at the switch) on the failure
warning switch push rod and drop the push rod out
of the way.
2. Remove the switch electrical lead.
3. Remove the two switch mounting screws and
remove switch.
Installation
1. Install the switch to the brake pedal bracket with
two screws and install the electrical lead.
2. Check the length of the failed switch push rod to
see that it is as described in Figure 74.
3. Adjust the switch so that the warning light will be
on after 5.10" pedal pad travel in the following
manner.
NOTE: The brake pedal to master cylinder
push rod will have to be removed to make
test to determine if the switch is properly set.
Adjust the brake pedal push rod travel as
described in this section upon completion of
installation.
4. With brake pedal hard against rubber bumper (A),
rotate brake failure warning switch lever (B)
forward and insert the preassembled push rod (C)
in the switch and brake pedal and lock in place.
LIGHT DUTY TRUCK SERVICE MANUAL
Summary of Contents for Light Duty Truck 1973
Page 1: ......
Page 4: ......
Page 6: ......
Page 53: ...HEATER AND AIR CONDITIONING 1A 27 LIGHT DUTY TRUCK SERVICE MANUAL...
Page 115: ...LIGHT DUTY TRUCK SERVICE M A N U A L HEATER AND AIR CONDITIONING 1A 89...
Page 123: ...BODY 1B 3 Fig 6 Typical 06 Van LIGHT DUTY TRUCK SERVICE MANUAL...
Page 149: ...BODY 1B 29 Fig 84 Body Mounting 06 Fig 85 Body Mounting 14 LIGHT DUTY TRUCK SERVICE MANUAL...
Page 171: ...LIGHT DUTY TRUCK SERVICE M A N U A L Fig 2 Frame Horizontal Checking Typical FRAME 2 3...
Page 173: ...LIGHT DUTY TRUCK SERVICE M A N U A L Fig 4 10 30 Series Truck Frame FRAME 2 5...
Page 174: ...2 6 FRAME LIGHT DUTY TRUCK SERVICE MANUAL Fig 5 Underbody Reference Points G Van...
Page 185: ...FRONT SUSPENSION 3 11 Fig 16 Toe out on Turns LIGHT DUTY TRUCK SERVICE MANUAL...
Page 224: ......
Page 266: ......
Page 351: ...ENGINE 6 15 Fig ID Sectional View of Eight Cylinder Engine LIGHT DUTY TRUCK SERVICE MANUAL...
Page 375: ...EN G IN E 6 39 LIGHT DUTY TRUCK SERVICE MANUAL...
Page 376: ...6 4 0 ENGINE LIGHT DUTY TRUCK SERVICE MANUAL...
Page 377: ...ENG IN E 6 41 LIGHT DUTY TRUCK SERVICE MANUAL...
Page 378: ...LIGHT DUTY TRUCK SERVICE MANUAL Fig 37L K Series Engine Front Mount 6 42 ENG INE...
Page 400: ...6 6 4 ENG INE LIGHT DUTY TRUCK SERVICE MANUAL...
Page 401: ...ENG IN E 6 65 LIGHT DUTY TRUCK SERVICE MANUAL...
Page 402: ...6 6 6 ENGINE LIGHT DUTY TRUCK SERVICE MANUAL...
Page 403: ...E NG IN E 6 67 Fig 36V C Series Engine Mounts LIGHT DUTY TRUCK SERVICE MANUAL...
Page 410: ......
Page 423: ...EN G IN E C OOLING 6K 13 Fig 16 Overheating Chart LIGHT DUTY TRUCK SERVICE MANUAL...
Page 424: ...6 K 1 4 ENG INE COOLING Fig 17 Coolant Loss Chart LIGHT DUTY TRUCK SERVICE MANUAL...
Page 456: ...6M 32 ENGINE FUEL Fig K15 Accelerator Controls G Van L 6 LIGHT DUTY TRUCK SERVICE MANUAL...
Page 492: ......
Page 512: ...Fig 18e Vacuum Advance Diagram V8 Engine...
Page 516: ...6 T 2 4 E M IS S IO N CONTROL SYSTEMS LIGHT DUTY TRUCK SERVICE MANUAL...
Page 528: ......
Page 590: ......
Page 593: ...CLUTCHES MANUAL TRANSMISSIONS 7M 3 LIGHT DUTY TRUCK SERVICE MANUAL...
Page 598: ...7M 8 CLUTCHES MANUAL TRANSMISSIONS LIGHT DUTY TRUCK SERVICE MANUAL...
Page 642: ......
Page 654: ......
Page 743: ...FUEL TANKS AND EXHAUST 8 13 LIGHT DUTY TRUCK SERVICE MANUAL...
Page 744: ...8 14 FUEL TANKS AND EXHAUST LIGHT DUTY TRUCK SERVICE MANUAL...
Page 760: ...8 30 FUEL TANKS AND EXHAUST Fig 40 Exhaust Pipe P Models LIGHT DUTY TRUCK SERVICE MANUAL...
Page 761: ...FUEL TANKS AND EXHAUST 8 31 LIGHT DUTY TRUCK SERVICE MANUAL...
Page 763: ...FUEL TANKS AND EXHAUST 8 33 LIGHT DUTY TRUCK SERVICE MANUAL...
Page 766: ......
Page 832: ...LIGHT DUTY TRUCK SERVICE MANUAL Fig 106 Power Steering Pump Mounting Typical 9 66 STEERING...
Page 833: ...PUMP ASSEMBLY STEERING GEAR TYPICAL SMALL V8 TYPICAL LARGE V8 STEERING 9 67...
Page 861: ...STEERING 9 95 Fig 134 Power Steering Pump Leakage LIGHT DUTY TRUCK SERVICE MANUAL...
Page 864: ......
Page 876: ......
Page 886: ...11 10 CHASSIS SHEET METAL LIGHT DUTY TRUCK SERVICE MANUAL...
Page 891: ...ELECTRICAL BODY AND CHASSIS 12 5 LIGHT DUTY TRUCK SERVICE MANUAL...
Page 934: ......
Page 942: ......
Page 970: ......
Page 972: ......
Page 974: ......
Page 976: ...V...
Page 978: ......
Page 979: ......