I did a disc from drum conversion on my 69 rr,the basic swap 76 a body spindles ,new rotors,calipers,master. The brakes never seemed right,I've tried different bore masters without any changes So the other day I put a pressure gage on it and only got 500lbs of pressure. These are power brakes I used the booster that I had with the drums,the only thing I didn't change was the distubution block. I have a electric vac pump'so plenty of vac,pedel isn't hard,car just doesn't want to stop and no pressure to front. Any thoughts??? THANKS EDDIE B