I am having a problem with my hydra booster type ABS brake system. on 1996 GMC Safari

when I apply pressure on my brake pedal to stop sometimes the pedal is hard to apply and the is hard to stop. Other times there no symptoms..I just replaced my brake hydra booster with a AC Delco reman. I flushed the p.strg fluid out several times, I still have the hard pedal intermittently. Any suggestion will be greatly appreciated.

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thanks in advance to whom ever is reading this


Asked by for the 1996 GMC Safari
poss p/s pump not creating enough pressure in system