when out on the lawn there arose such a clatter....

no this time it was not santa claus. it was me with a pressure washer....trying-somewhat to no avail-to get tons of mud off the bottom of daniel's truck. we are trying to fix his brakes, which have not worked too well since we went mudding. cannot seem to find the problem however, so i send out this request to the mechanically inclined (although i have a 133 mechanical...same scoring method as an iq test). here is the situation...the pedal has no pressure, even when pushed all the way to the floor...the brake fluid resevoir keeps loosing fluid...no visible leaks can be seen...when the truck is moving, the brakes will bring the vehicle to a stop, but over a great distance....and after spending the better part of 3 hours working on the problem, i have no other ideas. please help.