Copper air line

[Jimifoster]

I accidentally cut what appears to be a copper air line. I’ve tried tracing it and it looks like it comes from the top of the air tank to where I cut it, which is directly above the steering wheel.
I feel like it’s safe to assume this is why I’m capping out at 75 psi in the front and rear (each)
I reckon I’m going to need advice on how to reconnect a copper line and maybe splicing length onto it.

It’s a Bluebird All American 2002, rear engine.

[Rochey6957]

If it goes up towards the dash it was likely to the parking brake release (if you have air/spring brakes) or to air horns or an air ride seat.

looks like you will need to put some dot flare fittings on that and splice back together

[Jimifoster]

Here’s a photo of a connection point under the drivers side

[Booyah45828]

Use a compression union. Your picture already shows one in use.

Or you can run new line, either cunifer or nylon, and replace all the unions and leak points.

[Jimifoster]

I’m mostly concerned with: what does/did the cut line connect to *inside* the bus

[Rochey6957]

Originally Posted by Jimifoster

I’m mostly concerned with: what does/did the cut line connect to *inside* the bus

parking brake
brake pedal assembly
air ride seat
air horns
air pressure gauges on dashboard
or wigwag valve

start looking around your dashboard for the other end?