Check ur brake fluid container in the engine bay area. If its not full, please top up with DOT3 brake fluid.
If its full or after filling still problem persists, see mechanic and ask him to check brake piston / booster it seems they are dying as per age.
P.S. Leakage of brake fluid is damn dangerous as it can cause fire if it drips on hot manifold, so attend that leak ASAP.