96 ABS problem
 

I just have one question. I am curious to know if anyone has had a similar problem, and if so what fixed it. I have a 96 1500, when I hit the brakes anything other than lightly if it is wet or snowy I can feel the ABS working but my pickup does not stop. The light does not come on, I have taken it to the dealership several times and they have ridden in it said that something was wrong but cannot find anything wrong with it. If anyone could shed some light on this I would appreciate any help, advice or thoughts.