BENDIX ATR-2 ANTILOCK TRACTION VALVE Service Data Sheet
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BENDIX ATR-2 ANTILOCK TRACTION VALVE Service Data Sheet

BENDIX ATR-2 ANTILOCK TRACTION VALVE Service Data Sheet

Antilock traction relay valve
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®
Bendix
®
ATR-2
™
CONTROLLER OR COVER
PLATE MOUNTING HOLES:
SEE NOTE
MOUNTING
BRACKET
BODY
SUPPLY PORT
NOTE: AN OPTIONAL COVER PLATE IS INSTALLED OVER THE TOP WHEN THE
ATR-2
™
VALVE IS MOUNTED REMOTE FROM THE ANTILOCK TRACTION CONTROLLER
FIGURE 1 - ATR-2
™
ANTILOCK TRACTION RELAY VALVE
DESCRIPTION
The ATR-2
™
antilock traction relay valve is a specialized air
brake valve developed for use on Bendix antilock/traction
equipped tractors only.
It is essentially three separate valves working in combination
in a single housing. An R-14
the base valve and is fitted with a modified cover containing
a bobtail tractor brake proportioning valve (reference Bendix
Service Data Sheet SD-03-1067) and a traction control
solenoid. The ATR-2
™
valve contains both air and electric
components and provides both the service braking and
traction control (differential braking) functions. A Bendix
antilock traction controller can be mounted to the ATR-2
valve or a cover plate can be installed and the antilock
controller mounted elsewhere on the vehicle.
The ATR-2
™
valve replaces the standard relay valve used to
control the rear axle service brakes and performs the
standard relay function during tractor-trailer operation. During
tractor bobtail operation, the ATR-2
application pressure to the lighter rear axle(s) brakes to
improve vehicle controllability and minimize rear axle(s)
wheel skid before antilock is required. The ATR-2
provides added vehicle braking control and reduces the
number of times antilock is actually needed.
AntiLock Traction Relay Valve
BOBTAIL
PROPORTIONING
VALVING
™
style service relay valve is
™
valve reduces brake
SERVICE PORT
CONTROL PORT
DELIVERY PORT (4)
Like the standard relay valve it replaces, the ATR-2
and its attached antilock controller is normally mounted
near the service brakes it serves. A mounting bracket,
furnished with the valve, permits either frame or cross
member mounting. All air connections on the ATR-2
are identified with cast, embossed letters for ease of
identification and installation. The letter identification and
air line connections are shown below for reference.
ATR-2
™
VALVE
AIR CONNECTION
Supply (to reservoir)
™
Delivery (to brake chamber)
Service (to brake valve rear delivery)
Control (to delivery of trailer supply valve)
The ATR-2
™
valve is part of the R-12
which includes the R-12
The internal components of the relay portion of all of these
valves are interchangeable with the R-12
™
valve
the same basic components are used to service all of them.
The ATR-2
™
valve is available with various crack pressures
to accommodate specific applications, however the standard
is 4 psi.
TRACTION CONTROL
SOLENOID
COVER
SUPPLY
PORT
2 PIN SOLENOID
CONNECTOR
EMBOSSED IDENT.
™
family of relay valves
™
, R-14
™
, BP-R1
™
, AR-1
™
valve and therefore
™
valve
™
valve
SUP
DEL
SER
CON
™
valves.

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Summary of Contents for BENDIX ATR-2 ANTILOCK TRACTION VALVE

  • Page 1 Like the standard relay valve it replaces, the ATR-2 ™ valve brake valve developed for use on Bendix antilock/traction and its attached antilock controller is normally mounted equipped tractors only. near the service brakes it serves. A mounting bracket,...

  • Page 2: Initial Charging

    INITIAL CHARGING During the initial build up of tractor system air pressure, reservoir air flows into the supply port and through internal CONTROLLER body and cover passages to the blend back piston and from there to the supply of the normally closed (NC) traction control solenoid.
  • Page 3 CONTROLLER TRACTION SOLENOID BRAKE VALVE TRAILER SUPPLY PROPORTIONING PISTON CHECK VALVE INLET EXHAUST RELAY PISTON INLET EXHAUST MODULATOR REAR AXLE RESERVOIR SERVICE BRAKE FIGURE 4 - SERVICE BRAKE APPLICATION CONTROLLER TRACTION SOLENOID BRAKE VALVE TRAILER SUPPLY INLET EXHAUST CHECK VALVE PROPORTIONING RELAY PISTON PISTON...
  • Page 4 chamber pressure, until service application pressure SERVICE APPLICATION - BOBTAIL TRACTOR exceeds approximately 30 psi. Service applications above (FIGURE 7) this pressure will result in a proportioned increase of the When the trailer supply valve (dash control with red octagonal preset initial brake application to the tractor’s rear brakes.
  • Page 5 CONTROLLER TRACTION SOLENOID BRAKE VALVE TRAILER SUPPLY INLET EXHAUST CHECK VALVE RELAY PISTON PROPORTIONING PISTON INLET EXHAUST REAR AXLE RESERVOIR MODULATOR SERVICE BRAKE FIGURE 7 - BOBTAIL TRAILER SERVICE BRAKES APPLYING (LESS THAN 80 PSI) TRACTION CONTROL - SERVICE APPLICATION spin upon acceleration under 25 mph.
  • Page 6 ™ valve fails to function as 0 psi described, or leakage is excessive, it should be repaired or replaced with a new or genuine Bendix remanufactured unit, ™ FIGURE 9 - ATR-2 VALVE PRESSURE DELIVERY CURVE available at any authorized parts outlet.

  • Page 7: Personal Injury Or Death

    THESE INSTRUCTIONS AVOID ® 8. Use only genuine Bendix replacement parts, PERSONAL INJURY OR DEATH: components and kits. Replacement hardware, tubing, hose, fittings, etc. must be of equivalent When working on or around a vehicle, the following size, type and strength as original equipment and general precautions should be observed at all times.
  • Page 8 FIGURE 12 - PARTIAL ANTILOCK TRACTION SYSTEM SCHEMATIC...

  • Page 9: Leakage Tests

    6. Make and hold a full (100 psi or greater) brake application Bendix remanufactured unit or repair using maintenance and note that full pressure is delivered to the chambers. kit piece number 109359, available at any Bendix authorized parts outlet. 7. Activate the dash mounted trailer supply valve for bobtail tractor operation.

  • Page 10: Cleaning And Inspection

    3. After installing the unit, perform the “OPERATION & 14. Remove the spring(22) then remove and retain the spring LEAKAGE TESTS” for the air valve before placing the cage(23) from the valve cover(2). vehicle in service. 15. Use shop air at the control port to extract the blend back piston(24) from the valve cover(2).
  • Page 11 Description Qty. Description Qty. Body Proportioning Piston Cover O-Ring Retaining Ring O-Ring Exhaust Cover O-Ring O-Ring Blend Back Piston O-Ring O-Ring Valve Spring Retaining Ring Valve Retainer O-Ring Inlet/Exhaust Valve Valve Seat Long Cap Screw Valve O-Ring Spring Relay Piston Sealing Ring O-Ring Inlet Seat...
  • Page 12 20. If the valve was equipped with a relay piston return spring(14), install the spring in the body, large diameter first. BW1791 © 2004 Bendix Commercial Vehicle Systems LLC All rights reserved. 6/2004 Printed in U.S.A.

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