alright my break pedal is really squishy right now. at first i thought was the fluid, it looked liek coke, so i put new fluid in and bled my brakes, but its still squishy. i noticed it gets EXTRA squishy and doesnt brake as well when going down hills. i also noticed what sounds like a big vacuum leak coming from under my hood. so i pop my hood and there are no lines unconnected, and the sound sounds like its coming from my master cylinder =\..any ideas on what i could do? also when i drive sometimes i hear my rotor rubbing on my pads, how do i get rid of that, its annoying as fawk. i can hear it loud when i drive by other cars.