I put a new caliper on the drivers rear, but I didn't have anyone to help me bleed so I had to wait over night to bleed the thing. Bled the new caliper, and viola! The pedal goes to the floor and barely stops the car now. I did not have this problem to start with. The lines, hoses, bleaders are not leaking, except the bolt for the new caliper for the hose was not quite tight enough so a few drops came out. I tightened it up, bled the master cylinder, and bled all four brakes, some air came out at first and then not any more. I went for a test drive and the pedal felt ok before I started it. (kinda hard as usual) then I started it and it went almost to the floor. I drove about two blocks really slow and when I stopped harder the brake light came on. I put it in reverse and it stops better and the brake light went out, but the car still barely stops now. Is the caliper I put on bad? Do I have air still in the system? Or did my MC magically go kaput over night??? Or something else??

 

You didn't bleed them right or it sounds like maybe your master went bad. The reason your master could have went bad after bleeding is because normally with your brakes working properly your pedel only travels so far down which in turn means the piston in your master only travels so far. As time goes on deposits form in the master at the end of the pistons travel. When you bleed your brakes you push the pedel all the way to the floor beyond it's normal travel range in turn forcing the piston futher in the bore causing it to be pushed through all those built up deposits which can sometimes damage the rubber seals and cause your master to go bad. This usually happens on older cars such as yours. That's why when you bleed brakes on a car that has an old master it's a good idea to place one foot behind the pedal while bleeding to limit the travel.