Brakes Stopped Working... Help!

The E-brake won't do much if the car is rolling backwards and is marginal at best going forward. Make sure your shoes are good and all the cables are free and adjusted is the best you can hope for there. As for your master cylinder going dry.....there is a leak whether you can see it or not. If you see nothing obvious around the wheels/backing plates, most likely it's the rear seal in the master cylinder. If you have power brakes, the fluid will leak into the booster (and eventually rot the diaphram). If it's manual brakes, the fluid is probably leaking down the firewall.....either inside or outside. You'll see the results on the outside because the paint is probably peeling off the firewall below the cylinder. If it's leaking on the inside, you have to pull up the carpet to see the damage there.