ok so i bought a new master for the brakes thinking this was the problem, i bench bleed the master and its all good, but still no pedal it goes right to the floor with a little pressure built up, their is air bubbles coming back into the resevoir after pumping, was told to replace the proportioning valve.......called mazda and cannot get one, if anyone is in the cleveland area who could help i would be much appreciated, i need to get this car on the road to drive, also are these cars brakes vacuum controlled? does the car need to be running to have pedal? please help