More than likely it is air in the lines, or the master cylinder has gone bad. I would try bleeding the brakes before replacing the master cylinder. Make sure you bleed them in the proper sequence as well. It should be right rear, left rear, right front, left front. Basically furthest from the master cylinder to closest.
Also, if you just replaced the pads, you might have to pump the brakes up about 10 times before you get pressure.
Yeah, pump them up a bit and see if that helps. If you get nothing after 10 pumps, I'd look for a leak, if no leak, then I might think master. A bad booster will cause a very hard pedal with not a lot of stopping.
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