Product Description
The Bendix 803115 R-12 Air Brake Relay Valve is a heavy-duty pneumatic component designed to provide fast, controlled application and release of compressed air in commercial vehicle air brake systems. Featuring a 5.5 PSI crack pressure, this valve helps deliver responsive braking performance by controlling airflow between the supply reservoir and brake chambers.
Designed for compatible commercial trucks and tractors, the 803115 features a Super Ram body with multiple delivery port positions, allowing it to serve as a replacement relay valve in certain discontinued ABS axle module assemblies. Its durable construction, integrated exhaust protection, and included mounting bracket make it suitable for demanding heavy-duty vehicle operation.
When used in compatible ABS axle module repairs, the R-12 relay valve provides the pneumatic relay function while separate ABS modulators handle electronic brake pressure control.
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Genuine Bendix R-12 air brake relay valve
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Manufacturer Part Number: 803115
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5.5 PSI nominal crack pressure
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Super Ram body configuration
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One 1/2"-14 NPT supply port
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Four active 1/2"-14 NPT delivery ports
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Eight delivery port positions, with four factory-closed
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One 1/4"-18 NPT service/control port
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Six horizontal and two vertical delivery port positions
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Integrated quick-exhaust functionality
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Protective exhaust dust shield
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Four slotted mounting holes, approximately 0.96" × 0.40"
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Universal mounting bracket included loose in box
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Operating temperature range: -40°F to 200°F
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Suitable for compatible ABS axle module replacement arrangements
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Replacement for Bendix 300205N
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Designed for heavy-duty commercial vehicle air brake systems
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New replacement valve
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Sold individually
The Bendix 803115 is identified as a service replacement relay valve for several discontinued ABS axle modules, including 5020027, K028380, K029064, K029090, K029091, K034765, K034766, K034767, and K035401.
The valve is also used in certain service arrangements where an older ABS relay assembly is replaced with an R-12 relay valve and separate ABS modulators. The modulators and associated electrical components are not included.
Before ordering, verify the original relay valve or axle module number, crack pressure, air port sizes, and mounting configuration. Replacement of an integrated ABS valve assembly may require separate modulators, air line changes, and additional installation hardware.
