1981 freightliner flc120

I have an 80 flc, it’s at my shop I won’t be around it until tomorrow. I’ll grab some pics for you tomorrow if nobody else comes through with some before then. I will say this, don’t know what trouble you’re having but the two shuttle valves that screw into the two front delivery ports on my truck switch between the trolley valve and foot valve for the trailer brakes can hang up and make air leak like crazy when you apply the brakes. I’ve taken them apart and cleaned and lubed them and they still stick, then taken them back apart and cleaned and put them back together dry and they work fine. No clue if that helps just the first thing that came to mind that I went through the last time I replaced the foot valve, I thought for sure I hade plumbed it wrong.

 

If you didn’t this time, number them. This is how I do it. Any way will work. I will mark the line, nut and the spot on the valve. I do the same when tearing a dash apart. No way in heck my tiny brain could ever remember how to reassemble anything LOL.

 

There's the pics of mine hope that helps.

 

There are also only three bolts to mount the valve. I have seen them mounted 1/3 of a turn off and the lines connected to the next row of ports. Look for that also.

 

Yes. Very important!