Air Brakes
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Joined: Dec 2003
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From: Saskatoon, Saskatchewan
How long is does it take? Tho I`ve never timed mine to be sure I think my L8000 takes about a minute and half to get to 120 psi from zero. You may have smaller air storage tanks.
New User
Joined: Feb 2010
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From: Laguna Hills
Might only need a new air governor.
Laughing Gas
Joined: Nov 2003
Posts: 898
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From: southeren Oh
X2 it be only loading the compressor part way.
Just how many mies on the truck/compressor?
(My 94 has 112K and it still looks like it has all its orignal Valves and compressor.)
Also yours should have 4 air tanks like most newer trucks.
Just how many mies on the truck/compressor?
(My 94 has 112K and it still looks like it has all its orignal Valves and compressor.)
Also yours should have 4 air tanks like most newer trucks.
Fleet Mechanic
Joined: Jul 2004
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Could be the governor. But, a lot of those trucks with Cummins engines have a muffler on the line coming out of the air compressor. It is a rectangular sheetmetal box just above and a little to the rear of the compressor. They are known to crack, and when they do you often have problem building air. The thing is since the line is before the check valve in the wet tank, the truck will hold air pressure no problem. It will only leak when the compressor is building pressure, and sometimes it is hard to hear the leak with the engine running. You might try checking it with soapy water.
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From: Newport, N.C.
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Glad you found the problem, one other thing for future reference, is the purge valve on the drier can do the same thing, usually aggravated by cold weather. Sticks in the cold, and leaks so bad it will not build air, and you usually can't hear it, and when you kill the engine, the air is all gone before the engine noise is gone. Either clean it, or just haul off and replace. I usually just replace, but I am in the service industry, and don't like comebacks. Glad she's fixed.
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