Old Sub - I did the front axel and master cylinder for under $100 for everything from NAPA (rebuild kits as cylinders were not pitted)
My GMC COE 450 has a hydrovac that I had rebuilt in Seattle for about $150 - $175 - looks like new and works well.
There is a guy on this site (I forget his name) that does brake cylinder sleeving as well using stainless sleeves . . . look for a post a few months ago in the big bolts forum for when I started my brake work on my 4400 and he had part #'s ready to go for me.
Turns out my rear axle is from a 55 second series or newer truck. I have another that has newer brakes and is a low mile vacuum shift 2 spd that I will stick under the 4400 when winter comes.
