Air problem

I have multiple issues with my air system. 2011 columbia day cab.
1. Sometimes when I set the brakes the truck will creep forward or backward, depending on slope, for a few seconds like the parking breaks aren't engaged.
I've also noticed that sometimes when pulling the parking break the trailer supply won't pop automatically. Two new brake chambers btw on the axle with the parking brakes. Was doing it before replacement and after.
2. Sometimes when I back under a trailer, typically a heavier loaded one, with full air tanks, I'll get out to hook up and when I get back in the truck to supply air my warning beeper is going off and the psi is at 6o on both tanks and won't rebuild even at high idle. I'll spend ten minutes and it won't rebuild. No audible leaks but im not the best at hearing. I'll shut down the truck and restart or just supply air at around 60 or 70psi and as im idling through the yard it will build up to 125psi and be good the rest of the trip.
3. Everyday when I get to my truck I have to build air which is not uncommon to me as most trucks I drove as a company driver did this but on my truck the secondary tank is the only one that looses pressure overnight.
If I bleed the both tanks down they build up simultaneously.
Just trying to figure this thing out.
I replaced my airline's awhile back to convert to rubber lines and I have a bendix valve on each line which I assume is a quick release valve. I had to remove them and not sure which one went on which line when replacing but they are identical so i don't think that is causing it. They are each pointed in the direction of flow by the arrow cast on the valve.
Also when the truck looses air after backing under a trailer like I mentioned when I do supply air you can hear air in the dash for quite a while in the valves.
Any ideas would be greatly appreciated
Thanks

 

Anyone? Treadle valve? Qr valve? Valve in dash?

 

Ok thanks. I'll start looking around more thoroughly.

 

10-4. Now if someone could just tell me where to find some more hours in the day. Seems like everytime something needs done something else needs done first.