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Fifty thousand miles is about the right time to need new pads, particularly
in the heavier EVC. The front and the rear pads are sized to wear out about
the same time. While the front pads are larger, they apply most of your
stopping power. One brake pad on each wheel has a wire embedded in it. When any one
of those four pads is worn down to that wire such that the wire is severed,
"brake warning light" circuit continuity is now lacking and the light on the
dash board illuminates. In addition, if for some reason a wire elsewhere in
the circuit gets severed or a connector is loose, circuit continuity is also
broken and the light will illuminate.

In my case, the front pads were the first to need replacement. When the
light illuminated at 73,000 miles, I found that one of the front pads had worn
to the extent that the wire in the pad was severed. Measuring that pad
revealed that I could expect about another 40,000 miles from the pad before the
pad's backing plate scraped the rotor. But that would mean 40,000 more miles
with a light and periodic buzzer. Hence, I changed the front pads and the
dashboard light extinguished. About 2000 miles later, the light again illuminated
and I found that the wire in one of the rear pads was severed. After
replacing the rear pads the light extinguished and remains so at 124,000 miles.

I suspect that the wire in each pad is embedded at an imprecise depth such
that once the wire is severed, one may have anywhere from zero to five mm of
pad remaining and perhaps more.

If you want to "reset the warning system" then you must restore circuit
continuity. My suspicion is that replacing the pads on all four wheels will
solve your problem. There are instructions in our files section for DIY pad
replacement.

Good luck,
Bob W.