Final answer:
The brakes and tires are the two most important vehicle controls related to friction.
Step-by-step explanation:
The two most important vehicle controls related to friction are the brakes and the tires. The brakes play a crucial role in controlling the speed and stopping distance of a vehicle by applying friction to the wheels. The tires, on the other hand, provide the necessary traction between the vehicle and the road surface, allowing it to grip and maneuver effectively.