I work for an Electrical contractor as a fleet parts manager. In the past few years we have been replacing the brake hydro boosters on these RAM 3500 Tradesman's. Just this morning one of the mechanics requested another one for a specific truck that had been replaced just over one year ago.
Anyone else noticed this issue?

 

We had a similar kind of issue... What we found and was the fix for the problem was changing brands of Brake Fluids... For some odd reason that fixed the issue from there on out... For us anyways.