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M929A2. Okay, I know to drain the third down first, then fourth down, then first one, then second one down. Thing is I have been doing one at a time, and by the time I get to the third and fourth to be drained, the tanks are nearly empty. I hear something let loose two or three times (varies)...

I have the opposite problem as the original post. The alarm works flawlessly but the low air and parking brake work only sometimes. When one don't work the other don't either. When one works they both work. No problems with the high beam indicator or the front axle engaged lights. I will check...

My line from the lift pump to the large fuel filter had small cracks and I went ahead and changed the one on the other side of the filter as well. Lots of folks said the square washer under the bolt holding that fuel filter canister in place gets warped and sucks in air there as well. The filter...

My line from the lift pump to the large fuel filter had small cracks and I went ahead and changed the one on the other side of the filter as well. Lots of folks said the square washer under the bolt holding that fuel filter canister in place gets warped and sucks in air there as well. The filter...

So how long (approximately) does it take to air down the tires from highway mode to cross country?

Driving my 5 ton, I like to do it like it was made to do. Slow and easy. My personal top speed is and will always be 45 mph in this high-bumpered vehicle. When I was in Germany in 1985 I drove an 800 series 5 ton which sat lower than the 929 I have now. I was driving in downtown Frankfurt...

Oh, I figured it dryed the air with the heater as well. I see, with it being so low, and having a purge, how it could expel water out of the system though. I will be doing this process using a friends garage and will make sure it is same as truck's air pressure. Thanks, as I doubt I would have...

Well, that sure sounds like it will get it all clean. I will follow those instructions to the tee. Seems as if you are right about that air dryer. Some water came out when I unhooked it's lines when replacing it and my first thought was that the heater in the dryer must not have been working. I...

Thank you very much juanprado. That link had a real nice photo. That post is a wealth of info.

Good call. It is somewhat different than before with that unloader valve issue but does make sense to keep it all together.

Well, it posted them vice-versa. Lower pic is rear of tank (closest to air dryer).

Ok. I have pics of both front and rear of the rearward tank that is immediately after the air dryer. First pic is rear of tank and second is front of tank. Can't see that valve anywhere.

Thank you. I will give the crc technique a shot.

So I did this and did find a line leaking. Started to rain so postponed the removal of said line but will do so shortly. I still want to clean up and/or replace that ppv valve if I can find it. I will take some pics shortly of my wet tank's rear (first tank after dryer) and post them. Thank you...

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.