my brakes pedal goes to the floor and i have all disc brakes?

Master cylinder is empty?
Air in the brake lines?


Top off the brake fluid, and bleed the brakes.

ADDED:
After replacing the brake pads, there is going to be some play in the brake pads to the rotors at first.
Press the pedal to the floor three times or so slowly to get the pads to seat.

If after five or so times, if the brake pedal still drops, you may need to replace the master cylinder...?
 
If YOU changed your back brakes, did you try and pump up the pedal a few times to replace the fluid you pushed out when you compressed the pistons? Maybe your brakes need to be bled. After over 30 yrs in the industry I still question why they allow the general public to buy safety parts and do their own installation when they have no idea what they are doing. And then the risk our lives as well as their own on the road when their money saving diy job fails.Maybe you need to let a pro do it next time, or at least warn people in your town that you did your own brakes and they don`t work
 
it don,t make any difference if you do have all disc brakes. you could have a busted line or hose. it also could be the master cylinder. it would,nt be air if you did,nt take the calipers off.
 
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