'88 2wd Ram 50 brakes

[zasher303]

Hi, I'm working on going through the brakes on my truck. And I want to replace all the steel lines and rubber hoses. But in hung up on this proportion valve looking thing almost straight above the rear axle.


Now I do have pretty good mechanical knowledge. And have talked to 2 auto mechanics that I take my stuff to. But neither one of the had seen something like this, or had any idea what is was.