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Tour Easy: Rear Brake Pads
A horrible grinding sound from behind me suggested it was time to replace the Tour Easy’s rear brake pads:

Tour Easy – worn rear pads – side Yeah, about half of the “Wear Line” text remains visible; the actual line is long gone to dust.
The retaining pin in the lower pad is twisted forward:

Tour Easy – worn rear pads – face The pad wore enough to let it scrape on the rim, which certainly can’t be good for it.
The new Kool-Stop KS-MTTSA pads tout their leading wedge’s suitability for scraping mud off the rims, which isn’t a problem with my use case:

Tour Easy – Kool-Stop MTTSA pads – 20873 miles The odometer reports 20873 miles since the last battery replacement fumble.