A good way to control your speed when tackling a decline is an exhaust brake. These units work by stopping the exhaust flow, which leads to increased back pressure that slows your engine down. This will keep your speed in check without using your brakes. Some exhaust brakes that will automatically adjust to your truck’s highest recommended pressure. When the unit is not in use, the exhaust will flow freely without restricting exhaust, so you can keep you power up and your temperatures low.