I have a short bed Dodge Ram 2500 24valve diesel 4x4. I recently hit a telephone pole dead center. I replaced everything that was wrong. Idid not have any problems with the brakes intill just recently. I checked there is no fluid that is leaking that I can see. If I pump the brakes it will build pressure but it only last for a miniute, then the pedal will go right to the floor not appling any brakes at all. As you can imagine this is quite the problem. What possibly could be wrong? Please give me an idea as this truck is my everyday transportation, and as of right now I do not have the funds to take it to a shop.