What I have done before is track the leak down my self and then get the shop to fix it... They don't so much mind the fixing but some are to lazy to do the finding...soapy water in a spray bottle helps to track it down if its not audible
Air Pressure Drops When Ignition OFF
Discussion in 'Questions From New Drivers' started by Gabru, Oct 27, 2017.
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x1Heavy Thanks this.
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To your quote above - it certainly seems like a tractor issue. But after the secondary is gone it'll leech the primary.
You work for Central Transport, per chance? Oldest piss-yellow equipment in the game? Lol. -
x1Heavy and slow.rider Thank this.
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Some great responses here, but one thing I have not seen mentioned yet is to check and see if the leak occurs only when the hi/low lever on the shifter is in one position or the other. The gear range shifting mechanism is pneumatic in most trucks.
I chased a leak like what you described for a while. The dash panel valve and another valve that i cant remember off hand were eventually replaced, and the truck hasn't had air issues since. -
I vote for the fan clutch or line to it. Depending on which style you have.
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Bet it is the brake valves on the dash, we replaced a bunch of these because of air leaks.
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at least 2 minutes while watching the air pressure gauge with the
engine off, the key in the
“on” position, and the park brake off. Leakage, if present, should be less than 5 psi for the 2
minutes. Continue the test by applying the park brake and then “pumping” the brake pedal to
release air. A visual warning should activate when the air pressure gauge drops below 60 psi. -
Last edited: Oct 28, 2017
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In the old days of the air starter trucks,you couldn't allow any air leaks at all,or else you'd be looking for a glad hand blow job,from another truck to get you started.If you're leaking air at the rate you described,it might be acceptable for some,but not me.I've had trucks that would hold air for weeks,when shut down.Like the guys say,get the soapy water,and someone with good hearing and get them fixed.It is working your compressor/unloader valve overtime.
Grubby, x1Heavy and Farmerbob1 Thank this. -
For those unfamiliar with air start trucks...
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