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So are these relay valves rebuildable? TM don't get into specifics, but my rearward one has a small leak. I can press on the disc and the rubber that is surrounding it and make it stop. It don't appear damaged or as if it could even seal by that piddly rubber surround. Maybe there is a seal...

Maybe they did away with them or relocated them with the A2.

Well, I just crawled under the truck and that valve is nowhere to be found. So is it supposed to be on the front of the wet tank? I actually looked at every air tank to be sure and cannot find a valve that looks near that anywhere.

Excellent. Thanks. I will call the big rig dealer in wheeling tomorrow and order one.

Mainly primary, but secondary follows suit about 40-50 psi behind.

Thanks for the pics. Now I know what I am looking for as well as where.

The wipers did fail and I am having different pressures on the guages, when it is acting up. I wont bypass the valve but give it a good cleaning and run it and order a new one since they're so cheap. Any suggestions on sources?

Couldn't wait to read this as I will after all have some time today to work on the truck. Looks like this is my issue but will know for sure in a few hours. Thanks again. Jim

Couldn't wait to get into this thread. Will do same procedure today as my symptoms are exactly the same minus the high pressure.

Thank you. I will study that thread this evening.

A new governor sure would be a good idea being they are fairly cheap. Where is this tractor protection valve at?

Excellent plan. Will do that later today. Thank you.

Thanks. I just did replace it with an mrap one last week. Had unloader valve stuck and fixed that too.

So I had the truck out for a 20 mile or so test drive yesterday. This is the longest drive I had taken with the truck to date. It started raining and I ran the wipers but after a few miles they just stopped. Looked at the gauges and they were around 50 psi. I pulled over and set the parking...

Auction has ended!!!

Changing it out yesterday I did in fact see this truck did NOT come originally with air dryer. The bracket was well installed but clearly evident that it wasn't original. Had drilled holes in bracket to bolt up to the crossmember. Definitely done by hand and off center. Good work though. Jim

So that's how business is supposed to be ran? Man, I've been doing it wrong all this time by treating customers the way I would want treated if I was in their shoes.

I agree with avoiding the high pressure. Seems well with the 122 lbs. now.

Well, I drained the tanks yesterday and when it got up to 120 today the ctis acted properly. She is good to go now in the air realm. Gonna put the new mrap dryer on soon anyway. Next up is cosmetics.

Well, the gasket was fine at it's sealing surfaces so I just reused it. Head was nice and flat (true). Them two back bolts just have a nice way of infuriating an individual trying to get them started into the head (basket). But I survived the angst with no damage to the truck or myself or my...