The brake pedal goes all the way to the floor,l need to pump it for effective braking.l have bled the brakes,changed the brake wheel cylinder kits,l even bought a new master cylinder but the problem still persists.

OK so you have a problem ,to start with you have done most things to fix the problem of no brakes NOW Jack up the front of the car with H/B/off now get some one in the car to work the brake when you say so, next get a small G clamp {infact buy 2} noe put a g clamp on the R/H/F brake pipedo it up only enough to stop the flow,now ask the other person to try the brake pedal {not to Hard ENGINE OFF} was the pedal any better on just the 1 push, if yes slightly then leave it on and do the other side, did that get better, if yes then take off 1 g clamp and do the same to the rear { you might have 1 pipe only in the middle of chassis }but do the same to rear IFrear works that the brakes are good peddel up hard then that is the problem brake so which ever one brings it up to hard brake that the one you need to work on AND LEAVE THE CLAMP ON TILL YOU HAVE FINNISHED IT.then bleed them all jacked up FRONT then REAR and make sure you have both G Clamps in you hand when finnished.
Let me know how you get on ,,,,,,,,,RON