The hydroboost offers more force than you can push with your foot, which is why the peddle goes down when the engine is running. I used to have that problem with my hydroboost. Its not the fault of the hydroboost, it is working correctly, as it is helping you push on the peddle. The most likely problem is the quality of the fluid. It is very likely turned to gel inside the reservoir. Time to complete flush the system and get the gel out of the bottom of the reservoir.
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2004 AllegroBay 34XB Nov 2017 Banks, Front & Rear Trac bars, Konis
Sold:'83 Revcon Prince 31' FWD GM Performance 502 w/Edelbrock MPFI, Thorley Tri-Ys & Magnaflows, 4L85E 4 spd. Tested to exceed 100 mph.
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