leaking fluid

It sounds like there is a fluid leak from the brake system at the right side tire you saw the puddle under. A complete brake inspection would be in order to determine exactly what is leaking and the need for new brake pads and or shoes.

Sounds like you are leaking from either the brake master cylinder, the wheel cylinders or the lines. Most brake repair places will diagnos free of charge, yoour brake system is hydraulic, which means that the fluid is what creates you pedal pressure, dont wait too long before getting checked

check the brake caliper