What are the roles of the left and right brake systems on an aircraft?

The left and right brake systems on an aircraft are primarily responsible for controlling the aircraft's movement during takeoff and landing. More specifically, they allow the pilot to manage how the aircraft rotates around its vertical axis, which is crucial during these critical phases of flight.

When taking off or landing, applying the brakes on one side can create a differential in braking force. This differential helps in turning or steering the aircraft on the ground, as well as stabilizing the aircraft in flight or during the landing approach. Proper use of the brake systems ensures that the aircraft maintains the desired trajectory and can enhance control under various conditions, which is vital for safety and performance during these critical moments.

Other options do not pertain to the role of the brake systems. Increasing engine power, setting cruise control, or assisting with autopilot navigation are functions handled by different aircraft systems and do not involve the operation of the brake systems.