How long does it take your truck to leak down (Air)

On newer trucks it’s all the plastic quick connects
Not one in particular will cause a noticeable leak but it’s that tiny bit from all of them that add up

I know of one guy who replaced all his plastic with brass
Not cheap

 

One dump truck 72 l9000 1-2 days to get to 0 depending on idk… but there’s almost nothing on that truck for air so very few places to leak and all brass compression fittings.
74 w900 2-3 hrs with trailer about 50 psi a couple more hrs to 0
95 l9000 dump truck 1 hr to 0 unless you have the Hvac vents in just the right place then maybe 2 hrs also minimal air system on this one. I think it’s the vent selector but I haven’t taken the time to fix it
My old boss had a 97 t800 kw that would hold 75 psi for months… don’t ask me how but it did and it was air ride and everything

 

Parked in the garage last Friday afternoon. always let the compressor run till dryer purge before shutdown.

Just got up in it to check it out to run it tomorrow morning.
no plastic lines in this thing. All aeroquip/ stratoflex.

 

1950 Fruehauf trailer doesn't have spring brakes and still holds air for months. Left gauge is system air from “red” supply line and right is “blue” service side. The sealco safety valve keeps 30 psi applied when park valve is set to the 30 cans to lock brakes like the 30/30’s with springs do and keeps about another 30 psi in the tank. This trailer is all original 1/2” copper hard line.

 

2023 Volvo 860 and holds air until I release it so far. Set for a week twice after running and everything full. My last truck leaked after a few 4-8 hours max.

 

You have some cool looking trucks.I’m just down the road from you off of 1103 in Cibolo. Maybe you can show me them one day.

 

Parked mine last Wednesday and had 90 psi when I looked earlier. But one trip can change that lol.That’s why I keep a spray bottle and dish soap on the truck.

 

96h+ from 120 psi to 60psi.
2012 VNL64T780.

 

My W900 will sit over the weekend and hold 70-80psi as long as the wind doesn’t bounce it around too much.

 

I almost ran over the pumps at the Husky in Hinton AB when the park brakes came off an old Peerless 16 wheel with that type of system on it. Woke up most of the way to the pump island and had to dive head first on the foot valve to stop it. Was an auction trailer from the coast, and it was -40 or so. I didn’t have the tractor set in case I had to rescue myself from froze up auction junk in the morning. Never considered that stupid park brake system sabotaging me.