Truck Repair Trailer air supply valve.

MurphyT

New Member
The trailer air supply valve will not stay engaged by itself. The trailer does charge if I hold it in but then the yellow valve pops out as well. Weird. No major leaks. Lots of air pressure. Tried several trailers. Same story. Ideas?
 

Spyder

Member
Sure sounds like an air leak to me. Watch the air pressure gauges. Are they dropping? The yellow(truck brake supply valve) is supposed to pop when air pressure drops below a set psi.
 

r3gulator3

IMA KEEP IT REDNECK
Supporter
Then, you’ve got something leaking somewhere. Either a brake can leaking back on the service side, through a relay valve, or the inturnals of the tractor protection valve is back feeding. Or, someone hooked some **** up wrong on your valve to mess with you.
 
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