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Tanks not equalizing


Jimmy Davis

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Let ne start by saying, I'm not an air brake expert by any means! Truck is 00 CH613 tri- axle tractor with a 460 & 18 speed. Not sure if the drop axle is factory or not. Problem is the tanks dont equalize at all & secondary will just keep dropping & not kick the comp on. Primary has to drop to kick it on. Also sec wont kick comp off @ 120. This is the one air prob we've not been able to fix. So far replaced foot valve, T&T park brake valve & gov. Thanks in advance!

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This sounds like a check valve issue......Is there an air dryer on this tractor & does it purge when the compressor unloads @ 115-120 psi? Have you checked/drained all the tanks (primary & secondary) to make sure they're not full of water from condensation?

If I can find my old schematics, do you have a fax # ~ I'll send them to you.

Bill

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