Not bench bleeding is a big mistake. You have to bench bleed. I know you dont want to hear this but your gonna have to take that master cylinder back off and bench bleed it. I hope you dont have a.b.s. cause if you do you just pumped it full of air. If that is the case you are going to have to pressure bleed it at a repair shop. after you bench bleed use this process to bleed your brakes start with the wheel farthest from the master cylinder have someone pump the brake pedal slowly about seven times then hold it to the floor. then you open the brake bleeder and air and fluid will come out. then close the bleeder make sure your assistant holds the pedal down to the floor the whole time until the bleeder is closed then have them pump the pedal again another seven times and hold it to the floor open the bleeder then close it again. keep doing this process until you see a clear stream of brake fluid coming out without it spitting air you will be able to tell the difference when the air is gone. then proceed to the next wheel farthest away from the master cylinder. make sure you keep the master cylinder full of fluid while you are bleeding dont let it go dry.
SOURCE: I HAVE A 95 F250
You need to check wheel cylinders, the only way that the brake peddle will go to the floor like that is if there is a lose of fluid pressure somewhere .
SOURCE: 2005 f150 spongy brakes
it sounds like your still not getting all the air out of your lines. it helps to have a brake bleeder but they are expensive, it also could be that the gasket inside the master cylinder is inverted even if it is a new master cylinder this could be the case, ive had four bad remanned ones in a row, before i got a good one... hope i could help
10
Inspect
Master Cylinder (Brake System)
Worn or leaking brake master cylinder.
11
Inspect
Brake Power Booster
Damaged booster vacuum line/check valve, or diaphram
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"did not bench bleed" is the first problem. You have forced air into your entire system, including the antilock Hydraulic Control Unit (HCU) Any attempts to bleed in a NORMAL fashion will now only result in moving air back and forth in the brake lines. The easist way to fix this is to open the bleeder at the furthest point from the master cylinder (Right Rear) and leave it open while slowly pumping the pedal several times. Then let it sit open for a few minutes. You should get a steady stream of fluid out of the bleeder without touching the pedal. If not, pump the pedal a few more times. (Be careful not to let the master cylinder run out of fluid or you will have to start over.) Close the bleeder, and repeat the same process with the right front. Then go to the left rear, then the left front. You will then have to bleed them using the usual method (Someone holding pedal down while you open and close the bleeders.)
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