5
BRAKE VALVE
BIAS VALVE
SUPPLY OR
HOLD
DIAPHRAGM
SPRING
HOLD
VALVE
EXHAUST
DIAPHRAGM
EXHAUST
VALVE
BRAKE
CHAMBER
EXHAUST PORT
FIGURE 8: M-30
™
MODULATOR NON ANTILOCK EXHAUST OF SERVICE BRAKES (RAPID)
FIGURE 9: M-30
™
MODULATOR ANTILOCK EXHAUST OF BRAKES
BRAKE VALVE
BIAS VALVE
SUPPLY OR
HOLD
DIAPHRAGM
SPRING
HOLD
VALVE
EXHAUST
DIAPHRAGM
EXHAUST
VALVE
BRAKE
CHAMBER
EXHAUST PORT
ANTILOCK HOLD
(FIGURE 10)
The antilock controller will place the modulator in the hold
position when it senses that the correct wheel speed (braking
force) has been attained. The antilock controller will also
place the modulator in the hold position, prior to entering
the reapply, when it detects recovery from a locked wheel
condition. In this mode of operation, the modulator supply/
hold solenoid remains energized while the exhaust solenoid
is de-energized. De-energizing the exhaust solenoid allows
