Is this a 4 wl drum car? If so make sure you have all 4 wheels adjusted to slightly drag. Either way be sure all the drums are dragging on the pads. Look very closely at the hoses all 3 while there is pressure on the pedal. I have seen them blow up when you apply the brakes. This will cause your condition, and no leaks. Pull the drums again and look closely around the wheel cylinders for wet.
