BENDIX BW1664 manual Operation, NON-ANTILOCK Hold Figure, NON-ANTILOCK Application Figure

FRONT AXLE SYSTEMS			REAR AXLE SYSTEM
WHEEL CONTROL	AXLE CONTROL		WHEEL CONTROL
		TO
	TO	ANTILOCK
		CONTROLLER
	ANTILOCK		TO
	CONTROLLER		ANTILOCK
M-21™OR M-22™MODULATOR			CONTROLLER
			M-21™OR M-22™
			MODULATOR
			CONTROLLER/
			RELAY ASSEMBLY
QUICK RELEASE VALVE		M-21™OR M-22™MODULATOR	M-21™OR M-22™
M-21™OR M-22™MODULATOR		QUICK RELEASE VALVE	MODULATOR
			TO
	TO ANTILOCK		ANTILOCK
		CONTROLLER
	CONTROLLER
		bw
SERVICE BRAKE	SERVICE BRAKE		SERVICE &
CHAMBER	CHAMBER		SPRING BRAKE
			CHAMBER

FIGURE 2 - WHEEL AND AXLE CONTROL SYSTEMS

They are as follows;

Identification	Air Line Connection
1	Supply
	(incoming air from foot valve or relay)
2	Delivery
	(air delivery to service actuators)
3	Exhaust
	(air exhaust during antilock control)

NON-ANTILOCK HOLD (FIGURE 4)

When the desired air pressure is attained in the service brake chambers, the brake system is in the holding position. In the holding position both solenoids in the modulator remain de-energized and the balance of the internal components remain in the same position as they assumed during application.

OPERATION

NON-ANTILOCK APPLICATION (FIGURE 3)

During normal non-antilock braking, both solenoids are de- energized (no electrical power). Brake application air enters the supply port of the modulator and flows to, and through, the open exhaust solenoid then to the exhaust diaphragm. Air pressure, along with spring force, seats the exhaust diaphragm on the exhaust passage thus preventing the escape of service air. Simultaneously, application air flows to the supply diaphragm and forces it away from its seat. Air flows past the open supply and out the modulator delivery port to the service brake chambers.

2