Bendix Commercial Vehicle Systems SR-5 TRAILER SPRING BRK VALVE 4/11 - Manual (Page 6)

6
FIGURE 8 FAILED TRAILER RESERVOIR
PRESSURE
PROTECTION
VALVE C
SPRING
BRAKE
CHAMBER
TRAILER SERVICE RESERVOIR
EXHAUST
TRAILER SERVICE
CHECK
VALVE B
SERVICE/SPRING
BRAKE RESERVOIR
CONNECTION
SERVICE
RELAY
VALVE
TRAILER SUPPLY
FAILED TRAILER RESERVOIR (SEE FIGURE 8)
Should trailer reservoir pressure be lost, trailer service braking
is no longer available. Pressure protection valve C will close
at approximately 70 psi (minimum), retaining air pressure in
the trailer supply line.
The air held by the pressure protection valve will continue to
hold the control piston’s inlet valve open, supplying air to
the spring brakes. Thus, no automatic spring brake
application occurs. However, trailer supply line air can be
used to apply and release the trailer spring brakes repeatedly.
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
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.
Always wear safety glasses.
2. Stop the engine and remove 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.
3. 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.
4. 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 an AD-IS
®
air dryer system or a dryer reservoir module, be
sure to drain the purge reservoir.
5. Following the vehicle manufacturer’s
recommended procedures, deactivate the electrical
system in a manner that safely removes all
electrical power from the vehicle.
6. Never exceed manufacturer’s recommended
pressures.
7. 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.