Bendix Commercial Vehicle Systems SRC-7000 TRAILER SPRING BRAKE VALVE - Manual (Page 5)

5
FIGURE 7 - ANTI-COMPOUNDING APPLICATION
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
a Bendix
® 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.
SPRING
BRAKE
CHAMBER
EXHAUST
SERVICE/SPRING
BRAKE RESERVOIR
CONNECTION
SERVICE
RELAY
VALVE
DELIVERY
TRAILER SERVICE
TRAILER SUPPLY
SUPPLY
ANTI-COMPOUNDING (SEE FIGURE 7)
The Bendix ® SRC-7000 ™ trailer spring brake valve has
an anti-compounding feature. (See Figure 7.) A single
check valve in the SRC-7000 ™ valve cover prevents brake
compounding (simultaneous spring brake and service
brake application), which creates extra load on foundation
brake components.
If a trailer service application is being made and at the
same instant a park application is made, air in the service
line closes the anti-compounding section of the SRC-7000
™
valve. The air then fl ows out of the supply port and
exhausts through the tractor protection control. Future
compounding is prevented by the closed tractor protection
valve. The anti-compounding port should not be used on
towing trailers. See Figure 2.
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