Description: ATR-6 Traction Relay Valve 12V, 4 PSI, 2 ports
Brand: Bendix
Condition: New
Part Number:
K025599
Specifications:
Mounting: 5/16-18 UNC-2A Stud (2x)
Mounting Bracket Location: Bracket loose in box
Connector Type: 2-Way Circular DIN (ISO 15170-1 Twist-Lock)
Body Configuration: 2 SUP / 4 DEL (2H + 2V)
Supply Port 1: 1/2-14 NPT
Supply Port 2: 1/2-14 NPT
Internal Supply Passage to Cover: Yes
Control Port Orientation (CW from Front Face): 90°
Delivery Port 1: 1/2-14 NPT
Delivery Port 2: 1/2-14 NPT
Delivery Port 3: Closed Port
Delivery Port 4: Closed Port
Exhaust Port: Dust Shield
Voltage (Nominal): 12 Volts
Maximum Operating Temperature: 185 °F (85 °C)
Minimum Operating Temperature: -40 °F (-40 °C)
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An ATR-6 (Antilock Traction Relay) valve is a heavy-duty air brake control valve used on commercial trucks and buses equipped with ABS (Anti-lock Braking System) and traction control.
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1. Fast brake application and release
Like a standard relay valve, the ATR-6 is mounted close to the brake chambers. It allows air to flow directly from a nearby air reservoir to the brakes instead of traveling all the way from the foot valve, which:
- Reduces braking delay
- Improves brake response
- Helps the vehicle stop more predictably
2. ABS operation
When the ABS detects that a wheel is about to lock during braking, the electronic controller can command the ATR-6 to adjust brake pressure at that axle.
This helps:
- Prevent wheel lockup
- Maintain steering control
- Reduce skidding
3. Traction control
When a drive wheel spins on a slippery surface (snow, ice, mud, wet pavement), the traction control system can use the ATR-6 to apply brake pressure to the spinning wheel.
This:
- Transfers torque to the wheel with better grip
- Helps the truck get moving
- Improves stability during acceleration
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Signs of Faulty:
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1. Air leak near the valve
One of the most common failures is an internal or external air leak.
Symptoms:
- Hissing sound around the valve
- Air system takes longer to build pressure
- Compressor runs more frequently
- Difficulty maintaining air pressure when parked
2. ABS warning light
If the electrical solenoid or wiring associated with the ATR-6 fails, the ABS controller may detect a fault.
Symptoms:
- ABS light stays on
- Stored ABS fault codes
- ABS system becomes disabled
3. Traction control warning light
Because the ATR-6 is used for traction control on many trucks, a failure can trigger:
- Traction control warning lamp
- Loss of automatic traction assistance on slippery roads
4. Brakes apply slowly or release slowly
The relay-valve portion may stick internally.
Symptoms:
- Delayed brake response
- Brakes dragging after pedal release
- Uneven brake feel
5. Drive axle brakes behave abnormally
A sticking or malfunctioning ATR-6 may cause:
- One axle braking harder than expected
- Erratic brake application
- Unexpected wheel lockup under some conditions
6. Poor traction on slippery surfaces
If the traction-control function isn't working:
- Drive wheels spin more easily
- Reduced ability to start on snow, ice, gravel, or mud
- Truck gets stuck more readily
7. ABS fault codes related to pressure modulation
Common diagnostic systems may log faults involving:
- Traction relay valve circuit
- ABS modulator performance
- Solenoid open circuit
- Solenoid short circuit
- Valve response errors
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Manufacturer informationA part of the Knorr-Bremse Group,
Bendix® provides the automotive and truck parts industry with cutting-edge energy management solutions, active safety technologies, and air brake charging for tractors, buses, commercial vehicles, trailers, as well as medium- and heavy-duty trucks throughout North America. Headquartered in Elyria, Ohio, Bendix Commercial Vehicle Systems employs over 3,200 people who work hand in hand for the accomplishment of the brand's vision: "to become the leading worldwide supplier of active vehicle safety systems within the commercial vehicle industry." This brand takes pride in being the first to introduce many notable parts and technologies to the North American commercial vehicle market. Among these many firsts are the groundbreaking air brake system technologies such as air dryers, air compressors, and ABS. At Bendix, exceeding industry standards is a strict requirement.
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