hydro boost ?
 

My truck has hydro boost from a mid 90s astro. It has worked great, till it started leaking. My pick a part has a **** load of astros with hydro boost, for like 15 bucks. However theres is a full size van with hydro. Is there a difference in these units in output are is hydro boost hydro boost.

Most of the differences are in the Piston size of the Master Cyl., Pump output Pressure and Pedal ratio.
Hydro Rebuild Kits can be found fairly cheap on Evilbay sometimes.
http://www.ebay.com/itm/Hydro-Boost-...item2eb8e97546

http://www.ebay.com/itm/Hydro-Boost-...item256906c319

This is one of the best Hydro Operation, Diagnosis and Repair articles I've found.
http://www.brakeandfrontend.com/Arti...t_systems.aspx

thanks for the artical good info. I saw the rebuilds on ebay. just the pic a part boosts are cheeper and no taking apart.