Bendix Commercial Vehicle Systems ATR-1 ANTILOCK TRACTION RELAY 02/11 - Manual (Page 3)

3
FIGURE 4 - SERVICE BRAKE APPLICATION
FIGURE 5 - SERVICE BRAKES HOLDING
SERVICE BRAKES HOLDING (FIGURE 5)
The air pressure being delivered to the brake chambers is
also present beneath the relay piston.
When the air pressure above and below the relay piston
is equal, the piston moves slightly allowing the inlet valve
to return to its seat. The exhaust valve remains closed.
With both the inlet and exhaust valves closed, air pressure
in the brake chambers is held stable and neither increases
nor decreases.
BRAKE
VALVE
SPRING BRAKE
REAR AXLE
RESERVOIR
RELAY PISTON
TRACTION
SOLENOID
MODULATOR
INLET EXHAUST
CHECK VALVE
CONTROLLER
BRAKE
VALVE
RELAY PISTON
TRACTION
SOLENOID
MODULATOR
INLET EXHAUST
CHECK VALVE
CONTROLLER
REAR AXLE
RESERVOIR
SPRING BRAKE