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The 2000 Patriot Thunder has a driveshaft mounted parking brake. Sort of a car-like "brake rotor and caliper". There is a known problem with this setup which causes the brake lining to wear out.
Normally parking brake lining doesn't wear out as the wheel (driveshaft in this case) is not turning when the pk brake is applied. But a dragging/sticking caliper can cause pressure on the lining while driving which wears out the lining.
I have a write up on this on my "Known Problems" section (page 14). The (top) link in in my signature line below.
So the fix is to remove that Beaver setup and switch over to a "Wabco Microbrake lock".