Brake System Components include which subsystems?

• A. Air, hydraulic, parking, and dynamic systems
• B. Electrical and electronic control units only
• C. Fuel delivery and ignition systems
• D. Cooling and lubrication systems

Answer: (A)

Brakes rely on several distinct ways to create and control stopping force. The air (pneumatic) subsystem uses compressed air to apply brakes on many heavy vehicles. The hydraulic subsystem uses fluid pressure generated by the master cylinder to actuate the wheel brakes. The parking subsystem provides a means to keep the vehicle from rolling when parked, typically through a cable or electronic mechanism that locks the brakes. The dynamic subsystem involves braking via energy-dissipation methods like electric motor braking or regenerative braking, used in electric or hybrid vehicles (and in some other braking applications).

Together, these cover the main approaches by which braking force is produced and controlled. Other options focus only on electrical control units, or on systems not directly part of braking (fuel/ignition, cooling, lubrication), so they don’t encompass the full braking system like the listed combination does.