The Power Stop Z36 truck and traction brake kits offer the excellent braking power required by those who pull, drive over mountainous terrain or get off the road off the road. Whenever you add weight to your vehicle by towing a load, towing a trailer, or adding a larger combination of wheels and tires, you change the operating conditions of your brake package. The load and traction brake sets are made of specially matched components designed to create the braking torque required due to an increase in wheel diameter or load.