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PS flush w/Hydro Boost

791 views 1 reply 2 participants last post by  Walkers 
#1 ·
'04 Silverado 1500 Z71.
Watched several youtube vid's on flushing the PS system with Hydro Boost brakes. Removed the rubber return line on the booster and replaced it with a piece of clear tubing to a catch pan. When I started the engine fluid pimped out of the return line to the PS pump. Not supposed to do that. I installed the unit about 10 years ago due to the crappy OE brakes. Its works fine. Just wanted to change the PS fluid 'cause it looked like used motor oil.
So why would the return line pump fluid?

Dave.
 
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