Just finished all the plumbing and stuff involved in putting a dual piston master cylinder and matching power booster for a 4 wheel drum 69 Caprice into my 60 LeSabre. This swap was done on a recommendation from Fraz who has done the same thing. I also replaced the front wheel cylinders. The problem I am now having is that with the car running when I press the pedal it goes easily to the floor and when I let go it only returns about an inch. With the car off the pedal feels okay, it can be pushed to the floor but it takes some effort. My question is this; do I have too much vacuum going to the booster or do I just need to keep bleeding everything? If it is too much vacuum how do I restrict it? I'm afraid it is just air in the lines but bleeding sucks and Ive already done the entire car about 3 times and Im sick of it so I figured I would consult with the experts.