Bendix Commercial Vehicle Systems SRC-7000 TRAILER SPRING BRAKE VALVE - Manual (Page 4)

4
FIGURE 5 - PARKING APPLICATION
FIGURE 6 - OPERATION WITH A FAILED RESERVOIR
PARK APPLICATION (SEE FIGURE 5)
To park the trailer, either the trailer air supply valve or the
system park control valve (in the tractor) is actuated. This
vents the trailer supply line. The service reservoir is sealed
off. The quick release section, no longer under supply
pressure, is moved by air pressure from the spring brake
chamber. The exhaust opens, allowing air from the spring
brakes to exhaust through the open passage.
SPRING
BRAKE
CHAMBER
EXHAUST
SERVICE/SPRING
BRAKE RESERVOIR
CONNECTION
SERVICE
RELAY
VALVE
DELIVERY
SPRING
BRAKE
CHAMBER
EXHAUST
SERVICE/SPRING
BRAKE RESERVOIR
CONNECTION
SERVICE
RELAY
VALVE
DELIVERY
TRAILER SERVICE
TRAILER SUPPLY
SUPPLY
TRAILER SERVICE
TRAILER SUPPLY
SUPPLY
OPERATION WITH A FAILED RESERVOIR (SEE
FIGURE 6)
Should trailer reservoir pressure be lost, trailer service
braking is no longer available. The Bendix
® SRC-7000 ™
valve's internal spring force will trap approximately 70 psi
supply pressure, thus preventing spring brake parking.