Chosen Solution

I have an Audi a6, year 2000. My breaks were locking up every now and then and my break pedal was super tight. I did some research and found that i had to replace my abs sensors. I did that and now my breaks are acting the total opposite. My break pedal goes all the way to the floor and it is hard to stop my car. I tried to bleed the breaks but only two of them actually bleed. could this be a blockage issue? if so i feel like the blockage would cause my breaks to be hard such as too much pressure… could it maybe be the master cylinders? or did i just mess up my abs somehow?

bleed all of the brakes. you should be able to do that without any problem. but if the pedal goes to the floor… it looks like the system has air in it. check the brake booster, the master cylinder, etc…