Brake pedal goes to floor after changing pads?

93' F150. Had what seemed to be a caliper hanging up. bough new pads and compressed the caliper piston. Now my brake pedal goes to the floor. Question is could a hung up or non working caliper cause the pedal to go to the floor. Just replace the Master Cylinder and re bled the brakes but still have the same result. Pedal feels real good when bled but as soon as i drive it goes to the floor. Thanks
Brake pedal goes to floor after changing pads?
You probably twisted the brake hose putting the caliper back on. I see it all the time with DIY brake jobs.
Brake pedal goes to floor after changing pads?
did you go through the bleeding sequence?
didnt tighten bleeder or didnt get air out yet did you bleed master before hooking up lines if not you have to bleed a lot more air so id try bleeding system more that or your not bleed them right so type into search box how to bleed brakes
Don't know. If all the air is out of the system then they seem to work but don't when engine is switched on. Maybe it has power assisted brakes and the fault lies there.
A hung up caliper would actually give you a good pedal feel. First things, make sure your rear brakes are adjusted correctly. Then look at the front brakes. You said you replaced the master cylinder. If you DID NOT bench bleed it first, you have a bunch of air in your front lines.
sounds like a dumb answer but did you refill the master cylinder as you were bleeding the breaks or did you bleed the brakes and then fill the master cylinder?. Because if you weren't filling the master cylinder as you were bleeding the brakes then their is a chance that you have a tone of air in the master cylinder and that would make the pedal go to the floor if this is the case than go out and buy some more brake fluid because you have allot more bleeding to do. It could also be that the master cylinder it self could have a problem. The last thing that I can think of could be that the caliper is hanging up and over heating the brake fluid which would make the pedal go to the floor but that would happen after a few minutes of driving.
sounds like you might have a bad brake booster,or a vacuum leak somewhere.