Need help? We're here!
(888) 312-8812 Login SignupR-12 Relay Valve
For brake circuits that need reservoir air delivered close to the chambers, the Bendix R-12 Air Brake Relay Valve manages high-volume air delivery right near the brakes. A smaller service signal actuates the nearby reservoir supply, preventing main airflow from traveling long distances from the foot valve. Because R-12 series valves feature specific port arrangements and internal setups, exact matching is essential for proper system operation. Verifying these layout specifications ensures the Bendix 103009 installs directly into the R-12 position without requiring plumbing modifications.
BENDIX® AIR BRAKE RELAY VALVE
| Mounting: | .96 in. x .40 in. Slot (4x) |
| Supply Port 1: | 3/4-14 NPT |
| Supply Port 2: | 3/4-14 NPT |
| Maximum Operating Temperature: | 200 °F (93 °C) |
| Minimum Operating Temperature: | -40 °F (-40 °C) |
| Exhaust Port: | Dust Shield |
| Body Configuration: | 2 SUP / 2 DEL (H) |
| Control Secondary Service Port: | 1/4-18 NPT |
| Delivery Port 1: | 1/2-14 NPT |
| Delivery Port 2: | 1/2-14 NPT |
| Crack Pressure: | 4.0 PSI |
| TMC Washer: | RV040 |
| Mounting Bracket Location: | Loose in. Box |
The Bendix air brake relay valve works as a remote controlled brake valve designed to deliver or release air to the chambers when control air is delivered to it from the foot brake valve or other source. Because of this critical function, this product is engineered using state-of-the-art technology to ensure maximum performance even under harsh operating conditions.
| Product Type | Relay Valve |
| Valve Type | R-12 |
Be the first to review this product!
A 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.
Be the first to ask a question about this product!
Optional. Please do not use your full name.
Minimum 10 characters, maximum 500 characters
You can upload up to 3 images to help illustrate your question. Supported formats: JPG, PNG, GIF, WebP
Please complete the reCAPTCHA verification to submit your question.
California residents see

