Figured let me ask here as the pads might be the same between brands of cars. The Honda dealer told me the front pads on our 2002 Civic LX were almost wore out and I should do them now. So I took them off and looked myself...from the back of the pad plate(not including the plate) to the surface was .140". (the Haynes says 1/16" is wore out measuring like i did)
When I asked how they measured them he kinda acted that if I run them down so that the groove cut across the center of the pad is gone its time.(there was about .080" left in the groove) Man that leaves a fair amount of pad. I dont feel like doing the job right now(wait till it gets abit warmer)but is the dealers warning justified?