sometimes my car brakes properly...
sometimes i press the brake and the pedal gets pushed all the way to the end without any pressure or braking.
i have tried to bleed out the air bubbles, got new break pads and rotors... any other suggestions?

 

sounds like master cylinder to me.

 

Change your master brake cylinder ASAP before it fails and you ram me in the *** while I drive to Mcdonalds to get a Big Mac!

Change it and everything will be gravy! I just did mine not too long ago.. very easy job.

 

im looking around for a master brake cylinder. some have a brake booster and some dont?
whats the 411 on brake boosters? should i get one or not?