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The verdict is in. The lines where reversed as MWMules suggested they might be. I got a new air relay, but decided to put the old one back in to test it and it leaked air. So I put in the new one and it works great. Problem solved!!! Appreciate the advice from MWMules and Scrounger. Does anyone...

Thanks for the reply, I may have found the problem, but I will keep your info for future reference. I may still have problems and I have more than 1 trailer. Thanks again!!!

Well, funny you should say that. I just laid under the trailer for about an hour THINKING and making sure that I had hooked up the new air relay the same as the one I took out, no mistakes. Then I went into the shop and looked at the one I removed, it's in real good shape. I'm standing there...

This is my first post, so here you go. I have a M105 trailer and I believe it is the newer style brake system. Air goes into the trailer from rear of the truck, both sides, the service and the emergency lines. Goes thru the filters and into the air brake relay valve (2 sides) which is mounted...