BENDIX ATR1DC ANTILOCK TRACTION RELAY Manual - Page 3
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Also for BENDIX ATR1DC ANTILOCK TRACTION RELAY: Installation Instructions (4 pages)
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™
™
EC-16
OR EC-17
CONTROLLER
SOLENOID
CONNECTOR
BLEND BACK
PISTON
DOUBLE
CHECK VALVE
"B"
RELAY PISTON
SUPPLY PORT
INLET-EXHAUST
FIGURE 4 - SERVICE BRAKE APPLICATION
body and cover passages to the supply of the normally closed
(NC) traction control solenoid.
Brake application air from both the rear and front axle circuits
of the brake valve enters the ATR-1DC
secondary control ports. Secondary control pressure flexes
double check valve diaphragm "A" causing it to seal the air
passage leading to the solenoid and opening the passage
™
™
EC-16
OR EC-17
CONTROLLER
SOLENOID
CONNECTOR
BLEND BACK
PISTON
DOUBLE
CHECK VALVE
"B"
RELAY PISTON
SUPPLY PORT
INLET-EXHAUST
FIGURE 5 - SERVICE BRAKES HOLDING
TRACTION CONTROL SOLENOID
EXHAUST PORT
VALVE
™
valve's primary and
TRACTION CONTROL SOLENOID
EXHAUST PORT
VALVE
SECONDARY
SERVICE PORT
PRIMARY
SERVICE PORT
DOUBLE
CHECK VALVE "A"
DELIVERY
PORT
leading to double check valve "B". Primary control air flows
to double check valve diaphragm "B". Because primary
control pressure, from the foot valve, is 2 to 4 psi greater
than secondary control, double check valve diaphragm "B"
flexes in response to primary control and seals the air
passage leading to the secondary control. Air flows past
double check valve diaphragm "B" and through a passage in
the cover to the top of the service relay piston. In response
SECONDARY
SERVICE PORT
PRIMARY
SERVICE PORT
DOUBLE
CHECK VALVE "A"
DELIVERY
PORT
BRAKE VALVE
(SHOWING
DELIVERY AIR
LINES ONLY)
AIR BAG
BRAKE
CHAMBER
WHEEL SPEED
TONE RING
SENSOR
BRAKE VALVE
HELD IN
APPLIED
POSITION
AIR BAG
BRAKE
CHAMBER
WHEEL SPEED
TONE RING
SENSOR
3