1968 Eagle 05 undetectable air leak

[dtcerrato]

We have a couple manual pull valves on our 4104 & have to yank them multiple times to stop them from leaking - they're a PITA. Actually since we installed the drier we hardly ever pull them & when we do - nothing - but they still want to leak...

[tr206]

Well 24 hours after I changed the Aeroquip line that was leaking and aired it up I have 85 psi left pretty happy with that, still have to check the front air system. lesson learned as many times my head was right next to that line I never heard a sound and assumed it wasn't leaking.

[Friday1]

I was a mechanic for a big city fire department for 30 years. You cannot have leaky air systems on fire trucks. If there is a leak it will turn up with soapy water. If it is a big leak on a large component, like the air compressor air intake, I put my fingers over that area and spray it down to make it easy for bubbles to form. If you think a component can't be leaking and you are still searching, spray that component. I have found air tanks with pinholes and fittings that need U-joints and crowsfeet wrenches to tighten. Don't give up easy. Be suspect of every part of the air system.