Bendix Commercial Vehicle Systems MV-2 CONTROL MODULE - Manual (Page 2)

2
FIGURE 4
FIGURE 5
The trailer air supply valve (red button) (see Figure 1) delivers
air to the trailer supply line and also will trip (Pop out)
automatically and shut off the trailer supply if pressure
decreases to 40 ±5 P.S.I.
NOTE: Reservoir No. 1 must be the reservoir that supplies
the rear tractor axle(s).
Reservoir No. 2 must be the reservoir that supplies
the front axle.
The parking brake valve (yellow button) controls the spring
brakes on the tractor and when exhausted, simultaneously
causes the trailer supply valve to trip and exhaust, thus
applying both tractor and trailer parking brakes as required
by Federal Regulations. The trailer brakes may be
independently released by pushing only the trailer air supply
valve (red button) in.
OPERATION
Initial Charge
With the system completely discharged, both buttons are
out (Figure 4). When system pressure reaches 65 P.S.I.,
the red button (trailer supply) may be pushed in (Figure 5)
and should stay in, charging the trailer system and releasing
the trailer brakes. The yellow button may now be pushed in
which will supply air to the tractor spring brakes, releasing
them.
Normal Operating Position (Figure 7)
With both buttons pushed in, air is now being supplied to
the trailer and to the tractor spring brakes; all brakes are
released.
Actuation of Trailer Park or Emergency Brakes
(Figure 6)
To actuate the trailer brakes only, the red button is pulled
out, exhausting the trailer supply line. The trailer brakes are
now applied either by air emergency or spring brakes,
depending on the type of trailer system. This mode would
be used to uncouple from the trailer and during bobtail
operation.
System Park (Figure 4)
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 5)
If both valves are out, 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, in the normal run configuration, if the
supply pressure to the push-pull valves is reduced to
40 ±5 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 30 ±5 P.S.I., a tripper piston within the trailer
control spool will move upward, exhausting the trailer supply,
effecting the required non-override feature. The yellow (parking
brake) button will pop out at approx. 20-30 P.S.I.
PREVENTIVE MAINTENANCE
Important: Review the Bendix Warranty Policy before
performing any intrusive maintenance procedures. A warranty
may be voided if intrusive maintenance is performed during
the warranty period.
No two vehicles operate under identical conditions, as a
result, maintenance intervals may vary. Experience is a
valuable guide in determining the best maintenance interval
for air brake system components. At a minimum, the MV-2
™
module should be inspected every 6 months or 1500
operating hours, whichever comes first, for proper operation.
Should the MV-2
™ module not meet the elements of the
operational tests noted in this document, further investigation
and service of the valve may be required.
SERVICE
RESERVOIR #1
SERVICE
RESERVOIR #2
SYSTEM PARK
TRACTOR SPRING BRAKE CONTROL
SUPPLY TO TRAILER
MV-2 ™
CONTROL
MODULE
EXHAUST
QRV
SB-3
TP-3 ™
TRACTOR
PROTECTION
VALVE
SERVICE
RESERVOIR #1
SERVICE
RESERVOIR #2
CHARGE TRAILER WITH
TRACTOR PARKED
TRACTOR SPRING BRAKE CONTROL
SUPPLY TO TRAILER
MV-2 ™
CONTROL
MODULE
QRV
SB-3
T P - 3 ™
TRACTOR
PROTECTION
VALVE EXHAUST