I just had my front/rear rotors replaced with brembo cross drilled. I also had my rear calipers replaced. Now when I go to brake my petal feels much looser, and by the time car stops the pedal is close to the ground. I know its not a master cylinder because I got a new one recently. It has to be something to do with the calipers or rotors, but I am pretty sure they were installed correctly because I took them to a mechanic. Does anybody have any info on what may be my problem?

 

There may be air trapped in the hydraulic system. Try bleeding the lines again.