4 ms·Also, more exposed to salt spray than inboard motors.by wrycoder 4y agoAlso, more exposed to salt spray than inboard motors.sdk16420 4y agoDrum brakes are in the same spot and can last for the life of the vehicle.wrycoder 4y agoYou've not maintained drum brakes in New England, I guess. Not as finicky as calipers, but the cylinders do rust and fail.