8
SERVICING THE SR-7
IMPORTANT! PLEASE READ AND FOLLOW THESE
INSTRUCTIONS TO AVOID PERSONAL INJURY OR
DEATH.
When working on or around a vehicle, the following
general precautions should be observed
at all times:
1. Park the vehicle on a level surface, apply the
parking brakes, and always block the wheels.
2. Stop the engine when working around the vehicle.
3. If the vehicle is equipped with air brakes, make
certain to drain the air pressure from all reservoirs
before beginning ANY work on the vehicle.
4. Following the vehicle manufacturer’s
recommended procedures, deactivate the
electrical system in a manner that removes all
electrical power from the vehicle.
5. When working in the engine compartment the
engine should be shut off. 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.
6. 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.
7. Never exceed recommended pressures and always
wear safety glasses.
8. 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.
9. Use only genuine Bendix replacement parts,
components, and kits. Replacement hardware,
tubing, hose, fittings, etc. should be of equivalent
size, type, and strength as original equipment and
be designed specifically for such applications and
systems.
10. Components with stripped threads or damaged
parts should be replaced rather than repaired.
Repairs requiring machining or welding should not
be attempted unless specifically approved and
stated by the vehicle or component manufacturer.
11. Prior to returning the vehicle to service, make
certain all components and systems are restored
to their proper operating condition.
VALVE REMOVAL
1. Prior to removing the SR-7 apply the parking brakes
and drain all the vehicle reservoirs.
2. Identify all air lines before disconnecting.
3. Remove the two mounting nuts that secure the valve to
the frame rail and remove the valve.
VALVE INSTALLATION
1. Align the mounting studs with the mounting holes on
the vehicle frame rail. Tighten the mounting nuts to
180-220 in. lbs.
2. Install the valve onto the vehicle ensuring all ports are
connected as marked during disassembly.
TESTING THE REPLACEMENT SR-7 SPRING
BRAKE MODULATING VALVE
Perform operating and leakage tests as outlined in “Operating
Tests” section.
BW2271 © 2002 Bendix Commercial Vehicle Systems LLC 9/2002. Printed in U.S.A. All rights reserved.
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