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Well the truck brakes are massive, almost filling the offset area of a 20" rim and sticking out from the rim.. You also downshift for hill descent which cars typically don't do as well as being more aware of traffic and driving slower. OTOH, my daughter is complaining to KIA about her rear discs making noise after driving on a dirt road.
I would think that truck discs would be bigger and heavier than the equivalent drum brake
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