63 valiant, brake fluid gone missing...

well i stored my valiant over the winter made shur all fluids were topped up and good to go. Went to start it yesterday, pushed the brake pedal and thump right to the floor, abosolutly no resistance. MC was compleatly empty, topped it up and nothing still no pressure after pumping for 2 mins and MC is still full. Pushed it in my shop and i cant find no leaks anywhere...

Is there dye to add to brake fluid that can be seen with UV light or anything liek that? Dam car is usless qithout brakes.

NOTE-Car brake fluid was full when parked for winter, never touched it once till now and fluid is empty.