Seat Adapter and Finding the Correct Brake Relay Valve To Install the Roadmaster BrakeMaster

Updated 05/10/2023 | Published 05/08/2023

Question:

I am looking to buy and install the roadmaster brake system on a 2020 Ram 1500 new version. which seat adapter do I need? Also where do I tap into the air brakes on a 2015 Fleetwood expedition?

asked by: Shad L

Expert Reply:

For your 2020 Ram 1500, you're going to need the seat adapter # RM-88342. Since your 2015 Fleetwood Expedition has air brakes you're going to need to:

- Find the air brake relay valve, which is typically located near the master cylinder. There should be one or more open ports with threaded plugs.

- Test to verify that you have located the correct port (an assistant will be necessary for this test, to press and release the motorhome brake pedal.

- Slowly loosen the plug, do not remove it entirely. Then instruct the assistant to depress the motorhome brake pedal several times. Pressurized air should escape from the port each time the brake pedal is depressed. If pressurized air is only released when the brake pedal is depressed, you have located a port to attach the BrakeMaster air line.

- Turn the motorhome engine off. Remove the original fitting from the port, and thread the appropriate-sized
fitting into the port. Use a liquid Teflon sealant to seal the pipe threads.

- If an open port is not available, the BrakeMaster air line must be connected with a tee to the service port at
the relay valve or air booster housing.

If you have further questions regarding this part of the installation, you can find this on page 10 & 11 of the instructions.