You can see from my photo above that the brakes were worn down to the point where they tripped the sensor(s). Funny thing is that not once did the low pad warning light come on during my 1000 mile trip. It only came on after two washings, one before and one after the trip, but then it did finally come on during a little shorter trip around town. I had ordered new pads before my trip, but they didn't arrive in time. All turned out okay though I suppose.

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Len
'59 220S Cabriolet-SOLD and living happily in Malta
'83 240D 351,500 miles original owner-SOLD
'88 560SL 41,000 miles - totaled and parted out
https://sites.google.com/site/mercedesstuff/home
'99 E300 turbo 227,500 miles
'03 SLK320 40,000 miles - gave to my daughter
'14 Smart electric coupe 28,500 miles
'14 Smart electric cabriolet 28,500 miles
'15 Smart electric coupe 28,000 miles