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I also learned from another thread that the brake treaddle valve will leak air by to stack a sticking valve in it. So when truck is parked 30 min later no air
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______________________________________________________________________When you RELEASE the pedal, you will lose air, yes.
If you're just pressing down and holding steady, the needle should settle and not leak down more than 1 psi per minute.
If you have a leak down problem while firmly holding the pedal down (steadily), have someone go underneath the truck to see where the air is leaking (listen at each cyl)
Do a search for COLA air brake test.
• C = Air compressor cuts in.
• O = Air compressor cuts out.
• L = Low pressure warning.
• A = Air leakage.
Add brake antifreeze. Doesnt take much cold weather to cause chaos. My one truck wont blowoff at the dryer atmBump to the top, I'm having the same issue at the moment. Mine is venting the secondary tank with the brake pedal depressed, engine off into the stack. I thought I could hear it at the stop sign, so I tried it with the engine off when I got home. It might be just frozen being it's currently 23*F. So I'll let it warm up above freezing to recheck before replacing.
Anyone else having winter time freezing issues with the air brakes?
Did you try closing your primary tank to let the secondary build more pressure with the extra volume to see it would climb to let you engage the front axle and then open your primary?Yes , issues, When the cold air goes below -34, last night , the air pressure wont build above 70 to 80 psi . escaping air heard in stack. Worst part is it doesn't have enough pressure to engage the front axle drive when I need it to go down my driveway (every day in the winter) have added brake dry and it does work for a while , drain tanks every day, changed dryer filter, and dryer heating element (wasn't working) , freed the transfer case lock in valve , continue to have a problem , still working thru it , learn a lot here every day !
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