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SD-03-4504 |
Bendix® R-7™ Modulating Valve |
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EXHAUST |
CONTROL |
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EXHAUST |
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PORT |
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INLET |
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VALVE |
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MOUNTING |
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SPRING |
CONTROL |
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HOLE (2) |
BALANCE PORT |
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PORT |
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INLET |
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CONTROL |
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EXHAUST |
PISTON |
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VALVE |
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DOUBLE CHECK |
DELIVERY (2) |
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MOUNTING |
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VALVE |
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(SUPPLY PORT & |
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SURFACE |
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BALANCE PORT) |
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INLET |
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SINGLE |
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SUPPLY PORT |
VALVE |
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SEAT |
BALANCE |
CHECK |
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VALVE |
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PISTON |
DELIVERY |
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INNER SPRING |
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MOUNTING |
SUPPLY |
PORT (2) |
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HOLE (2) |
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OUTER SPRING |
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BALANCE |
CONTROL |
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INVERTED R-7™ VALVE |
EXHAUST |
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Some early versions |
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featured an adjusting screw |
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FIGURE 1 - EXTERIOR & SECTIONAL VIEW. |
INSET FIGURE 2 - INVERTED VIEW |
DESCRIPTION
The Bendix® R 7™ modulating valve is used in conjunction with a dual air brake system and spring brake actuators. Typically the R 7 modulating valve performs four functions:
1.Limits hold off pressure to the spring brake actuators.
2.Provides a quick release of air pressure from the spring cavity of the spring brake actuator allowing a fast application of the spring brake actuators. The valve delivers air to the park brake quick release valve (or relay) and also releases air in the control line to the quick release valve (or relay).
3.Modulates spring brake actuator application should a failure occur in the primary service brake system.
4.Prevents compounding of service and spring forces.
The valve has one 1/4" control, one 3/8" supply, one 1/4" balance, two 3/8" delivery NPTF ports, and an exhaust port protected by an exhaust diaphragm. The valve incorporates two 13/32" holes for mounting.
Note for model year 2001 and later International® Trucks only: There is an inverted R-7 valve, which appears inverted from the other pictures in this document. A standard R-7 valve and an inverted R-7 valve are not interchangeable. See Figure 2 for a picture of an inverted R-7 valve.
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GENERAL SAFETY GUIDELINES
WARNING! PLEASE READ AND FOLLOW THESE INSTRUCTIONS
TO AVOID PERSONAL INJURY OR DEATH:
When working on or around a vehicle, the following guidelines should be observed AT ALL TIMES:
▲Park the vehicle on a level surface, apply the parking brakes and always block the wheels. Always wear personal protection equipment.
▲Stop the engine and remove the ignition key when working under or around the vehicle. When working in the engine compartment, the engine should be shut off and the ignition key should be removed. Where circumstances require that the engine be in operation, EXTREME CAUTION should be used to prevent personal injury resulting from contact with moving, rotating, leaking, heated or electrically-charged components.
▲Do not attempt to install, remove, disassemble or assemble a component until you have read, and thoroughly understand, the recommended procedures. Use only the proper tools and observe all precautions pertaining to use of those tools.
▲If the work is being performed on the vehicle’s air brake system, or any auxiliary pressurized air systems, make certain to drain the air pressure from all reservoirs before beginning ANY work on the vehicle. If the vehicle is equipped with a Bendix® AD-IS® air dryer system, a Bendix® DRM™ dryer reservoir module, or a Bendix® AD-9si™ air dryer, be sure to drain the purge reservoir.
▲Following the vehicle manufacturer ’s recommended procedures, deactivate the electrical system in a manner that safely removes all electrical power from the vehicle.
▲Never exceed manufacturer’s recommended pressures.
▲Never connect or disconnect a hose or line containing pressure; it may whip. Never remove a component or plug unless you are certain all system pressure has been depleted.
▲Use only genuine Bendix® brand replacement parts, components and kits. Replacement hardware, tubing, hose, fi ttings, etc. must be of equivalent size, type and strength as original equipment and be designed specifi cally for such applications and systems.
▲Components with stripped threads or damaged parts should be replaced rather than repaired. Do not attempt repairs requiring machining or welding unless specifi cally stated and approved by the vehicle and component manufacturer.
▲Prior to returning the vehicle to service, make certain all components and systems are restored to their proper operating condition.
▲For vehicles with Automatic Traction Control (ATC), the ATC function must be disabled (ATC indicator lamp should be ON) prior to performing any vehicle maintenance where one or more wheels on a drive axle are lifted off the ground and moving.
▲The power MUST be temporarily disconnected from the radar sensor whenever any tests USING A DYNAMOMETER are conducted on a Bendix® Wingman® Advanced™-equipped vehicle.
▲You should consult the vehicle manufacturer's operating and service manuals, and any related literature, in conjunction with the Guidelines above.
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