I went out tp my 1993 150 (2wd, 300 cid) and found the brake pedal went to the floor. I can see brake fluid leaking down the spare tire carrier on the drivers side. the line is dry at the wheel. any idea where to start looking and what to look for? where can i find a diagram of the brake system (on-line)?

 

There is a T fitting on that side underneath check there.