Trailer Parking Or Emergency Brakes; System Park; Trailer Charge; Operation - BENDIX MV-3 DASH CONTROL MODULE Manual

OPERATION

During initial charge, with the system completely discharged,
both buttons are out (Figure 3). When system pressure
reaches 65 P.S.I., the red button (trailer supply) may be
pushed in (Figure 4) 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.
RED
TRAILER
SUPPLY
LINE
TRACTOR
PROTECTION
VALVE
TRACTOR
SERVICE
RESERVOIR #2
FIGURE 3 - INITIAL CHARGING OR SYSTEM PARK
RED
TRAILER
SUPPLY
LINE
TRACTOR
PROTECTION
VALVE
TRACTOR
SERVICE
RESERVOIR #2
FIGURE 4 - TRAILER CHARGED & TRACTOR PARKED
2
YEL
TRACTOR
SPRING
BRAKES
TRACTOR SERVICE
RESERVOIR #1
YEL
TRACTOR
SPRING
BRAKES
TRACTOR SERVICE
RESERVOIR #1
NORMAL OPERATING POSITION (FIGURE 5)
With both buttons pushed in, air is supplied to the trailer
and to the tractor spring brakes; all brakes are released.
RED
TRAILER
SUPPLY
LINE
TRACTOR
PROTECTION
VALVE
TRACTOR
SERVICE
RESERVOIR #2
FIGURE 5 - NORMAL OPERATING POSITION TRACTOR &
TRAILER
ACTUATION OF TRAILER PARKING 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 emergency air or spring brakes,
depending on the type of trailer system.
RED
TRAILER
SUPPLY
LINE
TRACTOR
PROTECTION
VALVE
TRACTOR
SERVICE
RESERVOIR #2
FIGURE 6 - TRAILER PARKED TRACTOR RELEASED
YEL
TRACTOR
SPRING
BRAKES
TRACTOR SERVICE
RESERVOIR #1
YEL
TRACTOR
SPRING
BRAKES
TRACTOR SERVICE
RESERVOIR #1