BRAKES 5-99
and leakagewise, then, if necessary, disassemble, clean
and lubricate.
BRAKE CONTROL VALVE (Fig. 142)
System Checking
Check the delivery pressure of both primary and
secondary circuits using a test gauge known to be ac
curate. Depress the pedal to several positions between
the fully released and fully applied positions and check
the delivered pressure on the test gauges to see that it
varies proportionately with the movement of the pedal.
When the pedal is fully applied and released, the reading
on the test gauge should fall off to zero. It should be
noted that the primary circuit delivery pressure will be
about 2.5 psi greater than the secondary circuit delivery
pressure with primary and secondary circuit supply res
ervoirs at the same pressure. This is normal in this
valve.
Build up pressure in the system to approximately 100
psi. Drain the primary reservoir. Make several full
brake applications, and note pedal force required to make
application approximately the same as with both circuits
operating. An increase in stopping distance, longer pedal
travel, or the low pressure warning system indicates a
malfunction in one of the circuits.
Leakage Tests
1. Fully charge air brake system.
2. Make several service brake applications and check
for prompt application and release at all wheels.
3. With service brakes released, coat the exhaust port
and top of the adapter valve (inside cab) with soap
suds. No leakage permitted.
4. If leakage occurs, replace brake control valve, or
repair or replace worn or damaged parts.
F ig . 1 4 2 -Brake Control V a lv e Components
F ig . 143-Double C h eck V a lv e and Stop Lamp Switch Components
DOUBLE CHECK VALVE & STOP LAMP SWITCH
(Fig. 143)
System Checking
With air pressure built up, remove air line from
Emergency Control Valve to Double Check Valve &
Stop Lamp Switch. Apply foot pedal. No air should be
exhausted from open port. Brake lights should light
immediately.
Reassemble line to port. Pull the manual Emergency
Control Valve handle out. Secondary brake system
should apply. A ir pressure at secondary brake chambers
should be up to delivery pressure. Also brake lights
should light immediately when handle is pulled out.
F ig . 144-DD 2 Safety Actuator Components
CHEVROLET TRUCK SERVICE MANUAL
EMERGENCY
PRESSURE
CHAMBER
MOUNTING
PORTION
OF ACTUATOR
EMERGENCY
(SECONDARY)
PORT
SERVICE PRESSURE
SERVICE (PRIMARY) CHAMBER
PORT
AUXILIARY
DIAPHRAGM
SERVICE
DIAPHRAGM
PUSH PLATE &
ROD ASSEMBLY
DRAIN HOLE
RETURN
SPRING
LOCKNUT
* YOKE
\
Содержание 10 Series 1968
Страница 1: ...ST 1 3 3 SB...
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Страница 52: ...HEATER AND AIR CONDITIONING 1A 21 Fig 32 Charging Schematic CHEVROLET TRUCK SERVICE MANUAL...
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Страница 128: ...BODY IB 61 Fig 135 A uxiliary Seat CHEVROLET TRUCK SERVICE MANUAL...
Страница 132: ...Fig 4 1 0 3 0 Series Truck Frame...
Страница 133: ...Fig 5 4 0 6 0 Single A xle Truck Frame E x c Tilt Cab...
Страница 135: ...Fig 7 4 0 6 0 Series Tilt Cab Truck Frames...
Страница 138: ...CHEVROLET TRUCK SERVICE MANUAL Fig 8 Underbody Reference Points and Dimensions Chevy Van G10 and G20 J FRAME 2 9...
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Страница 223: ...REAR SUSPENSION AND DRIVE LINE 4 54 Fig 101 Forward Rear Axle Assembly Exploded View CHEVROLET TRUCK SERVICE MANUAL...
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Страница 248: ...BRAKES 5 15 TD 50 60 Fig 26 Parking Brake Cables T Models CHEVROLET TRUCK SERVICE MANUAL...
Страница 299: ...BRAKES 5 56 Fig 88 Frame Mounted Vacuum Single Diaphragm Power Brake Installation CHEVROLET TRUCK SERVICE MANUAL I...
Страница 331: ...BRAKES 5 88 Fig 126 Stopmaster Brake Components Automatic Adjuster with Fail Safe CHEVROLET TRUCK SERVICE MANUAL...
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Страница 398: ...ENGINE FUEL 6M 5 Fig 7 C Throttle Linkage GS100 200 Fig 8C Throttle Linkage GE100 200 CHEVROLET TRUCK SERVICE MANUAL...
Страница 409: ...ENGINE FUEL 6M 16 Fig 12A CM KM 250 CM350 Fig 13A CM KM 250 CM350 CHEVROLET TRUCK SERVICE MANUAL...
Страница 410: ...ENGINE FUEL 6M 17 Fig 14A PE200 300 TE400 500 600 Fig 15A PT200 300 CHEVROLET TRUCK SERVICE MANUAL...
Страница 411: ...ENGINE FUEL 6M 18 Fig 18A V 8 Typical CHEVROLET TRUCK SERVICE MANUAL...
Страница 412: ...ENGINE FUEL 6M 20 ENGINE FUEL 6M 19 Fig 21 A CE100 200 With Heat Stove CHEVROLET TRUCK SERVICE MANUAL...
Страница 413: ...ENGINE FUEL 6M 20 Fig 2 2 A C S K A 1 00 200 CS300 With Heat Stove CHEVROLET TRUCK SERVICE MANUAL...
Страница 414: ...ENGINE FUEL 6M 21 Fig 25A CS PS SS400 CS M S SS500 CS600 TSOOO With Heat Stove CHEVROLET TRUCK SERVICE MANUAL...
Страница 470: ...CLUTCHES AND TRANSMISSIONS 7 7 Fig 14 Clutch Linkage Exploded View CHEVROLET TRUCK SERVICE MANUAL...
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Страница 549: ...STEERING 9 16 KA 10 20 CE ME SE 50 CE SE 60 Fig 29 Typical Power Steering Hose Routing CHEVROLET TRUCK SERVICE MANUAL...
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Страница 583: ...CHASSIS SHEET METAL 11 12 Fig 20 Designation and Name Plate CHEVROLET TRUCK SERVICE MANUAL...
Страница 585: ...CHASSIS SHEET METAL 11 14 SPECIAL TOOLS Fig 24 J 5544 1 Hood Spring Remover CHEVROLET TRUCK SERVICE MANUAL...
Страница 587: ...ELECTRICAL BODY AND CHASSIS 12 2 Fig 1 Fuse Panel CHEVROLET TRUCK SERVICE MANUAL...
Страница 591: ...ELECTRICAL BODY AND CHASSIS 12 6 CA SA MA 50 60 CHEVY VAN Fig 9 Front Lighting Assemblies CHEVROLET TRUCK SERVICE MANUAL...
Страница 596: ...ELECTRICAL BODY AND CHASSIS 12 11 Fig 15 Electrical Components Conv Cab CHEVROLET TRUCK SERVICE MANUAL...
Страница 611: ...r ELECTRICAL BODY AND CHASSIS 12 26 9 CHEVROLET TRUCK SERVICE MANUAL...
Страница 622: ...ELECTRICAL BODY A N D CHASSIS 12 37 IGNITION SWITCH Fig 44 Engine Compartment PA20 30 CHEVROLET TRUCK SERVICE MANUAL...
Страница 623: ...ELECTRICAL BODY A N D CHASSIS 12 38 Fig 45 Engine Compartment PS40 CHEVROLET TRUCK SERVICE MANUAL...
Страница 633: ...ELECTRICAi BODY A N D CHASSIS 12 48 Fig 55 Engine Compartment SE50 60 02 62 CHEVROLET TRUCK SERVICE MANUAL...
Страница 634: ...YJ ELECTRICAL CHASi V 49 4 Fig 56 Engine Compartment C D C G CD60 CHEVROLET TRUCK SERVICE MANUAL...
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Страница 698: ...SPECIFICATIONS 12 ENGINE TORQUES CHEVROLET TRUCK SERVICE MANUAL...
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