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brake. That is what they are there for. Trucks downshift because they have heavy clutches. Also, if they are loaded up, their brakes will quickly overheat. They just cannot put enough rotor under their wheels to act as a heat sink. One reason they have so much lash when they take off. Brakes are a lot cheaper. I just replaced the pads on my wrx at 50,000 miles, and they still probably had 10,000 miles to go. My acura had rears replaced at over 40,000 and fronts at over 60,000.
BTW, braking and downshifting will not slow you down faster than braking alone. Tires are what limits your braking ability. This is of course unless you are going really fast, like well over 100 mph. But if you can lock up your brakes, then the engine will not stop you faster. and if you are panic stopping or racing, there is not enough time to downshift and brake and steer. notice racecars do not downshift to slow down. Many would spin if they did that, because one set of tires would decelerate faster than the other set, causing the car to break free and slide.
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