while changing out the pads on my front discs, (75 with power brakes) i let the brake fluid drain out of the master. I bled the wheels but did not bleed the master cylinder. when the car is off i have a firm pedal. when the car is on the pedal goes to the floor with no resistance. do i just have to bench bleed the master and then re-bleed all four wheels, or is there something else going on? the discrepancy between car on and car off is more than my diagnostic mind can handle.

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