97 freightliner fld secondary gauge losing air 120 lbs to 5 lbs in 15 min. Where to start looking for leak. I have 4 air tanks.
Air leak
Discussion in 'Trucks [ Eighteen Wheelers ]' started by heavyhaulerss, Jul 25, 2019.
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Might be a able to hear the leak. Take it to a quiet area and closely listen in all the areas.
heavyhaulerss Thanks this. -
Does it lose air without the brakes applied?
heavyhaulerss Thanks this. -
Set trailer brake, choke wheels and release tractor parking brake. Get out of the truck and listen for air leaks
heavyhaulerss Thanks this. -
Agree with others. That much loss should be very audible.
heavyhaulerss Thanks this. -
Does it happen with valves out? If so, this will narrow down the possibilities. If not, try it with one valve in at a time and try to isolate the leak.
Example. Trailer or truck. Emergency pressure or brake application pressure.
This can all be done right from the cab.heavyhaulerss Thanks this. -
don"t forget the spray bottle of soapy water, my first truck was a 97 FLD 4 axel
to run paper from Ponderay to Salt Lake, great truck till Freedom Freightliner in
Spokane rebuilt the engineheavyhaulerss Thanks this. -
Do you have a dump valve? Dump your bags and see what happens. If no change at least you eliminated one part of the system.
heavyhaulerss Thanks this. -
Thank you. all. I found it. It is some sort of pressure relief valve on the short air tank. Looks like a button on 1 side and it was pouring air. freightliner had it in stock. Much appreciate the help.
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I use one of these Ultrasonic Leak Detector. It’s the cats meow.
I’ve found leaks I didn’t even know I had. My truck use to go 20 minutes between compressor purges. Now I goes two hours and I pull two trailers.heavyhaulerss and Hegemeister Thank this.
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