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SYSTEM PARK (FIGURE 3)
With both buttons in for normal run modes, the parking
brakes on both tractor and trailer may be actuated by pulling
the yellow (parking brake) button out, which exhausts the
air from the tractor spring brakes and simultaneously causes
the red (trailer supply) button to pop out, applying the trailer
brakes. This complies with Federal Regulations that one
control must apply all the parking brakes on the vehicle.
TRAILER CHARGE (FIGURE 4)
If both buttons are out when parking the combination vehicle
and it is desired to recharge the trailer (leaving the tractor
spring brakes applied), the red button may be pushed in,
repressurizing the trailer supply line. This mode might also
be used to park a combination vehicle with air actuated
emergency brakes on the trailer to provide demonstrated
parking capability with tractor spring brakes only.
AUTOMATIC APPLICATION
With both buttons in (the normal run configuration), if the
supply pressure to the push-pull valves is reduced to
approximately 20 to 45 P.S.I., the red button (trailer supply
valve) must pop out, applying the emergency or parking
brakes on the trailer. If the red button is held in manually
and the pressure decreases to approximately 20 P.S.I., a
tripper piston within the MV-3
exhausting the trailer supply, effecting the required non-
override feature.
OPERATIONAL TEST
1. With supply pressure at 120 P.S.I., push the red button in.
The button must stay in.
2. Slowly reduce pressure in both service reservoirs. The
red button must pop when supply pressure drops to 20
to 45 P.S.I.
Note: The yellow button must not pop out before the
red button.
3. Hold the red button in and continue to reduce pressure
in all service reservoirs. Air must start to escape from
the exhaust port when the trailer supply line pressure
reaches 20 P.S.I. minimum.
4. Release the red button and rebuild the supply pressure to
at least 120 P.S.I. Push in the yellow button; the yellow
button must remain in.
5. Charge the system to 120 P.S.I. and push both buttons
in. Pull the red button out. The yellow button must remain
in.
6. Push the red button in and pull the yellow button out.
The red button must pop out almost instantaneously.
™
valve will move upward,
7. Build both service reservoirs to 120 P.S.I. Decrease the
pressure at the secondary reservoir. The primary reservoir
pressure should not drop below 100 P.S.I. Repeat the
test for decreasing primary reservoir pressure. The
secondary reservoir pressure should not drop below 100
P.S.I.
™
8. If the MV-3
valve fails to operate as described replace
or repair it using genuine Bendix parts.
9. Close all reservoir drain cocks and deliberately caused
leakage points before placing the vehicle in service.
WARNING! PLEASE READ AND FOLLOW
THESE
INSTRUCTIONS
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
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.
8. Use only genuine Bendix
components and kits. Replacement hardware,
tubing, hose, fittings, etc. must be of equivalent
size, type and strength as original equipment and
be designed specifically for such applications and
systems.
TO
AVOID
vehicle
manufacturer's
®
replacement parts,
™
3
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