Adding air to pickup for air trailer brakes.

[jlawles2]

Not cheap but i found these: https://www.haldex.com/en/eu/air-brake/hydraulic-trailer-control-valve/?ProductionStatus=active note medium is brake fluid on several of the options.

 

[bssifter]

Ah Ha, That's why I couldn't source it in the states. It's only available from European distributors since you can tow legally over there. I appreciate the effort and will probably just use a hand lever before I spend the big bucks.

 

[johnmyster]

I wish they still made them like that for older vehicles

I have seriously considered putting an older Kelsey in my truck and ditching the modern accelerometer based progressive nonsense.

I regularly drove for a company that had a box truck with air over hydraulics. It was the worst of both worlds, but the hardware existed to do it. Unfortunately the hardware doesn't apply to your use case. In your case I imagine you'd be best served to have a fairly large compressor, a tank, and some kind of electric to air proportional regulator driven by 0-12 VDC from your trailer brake controller.