What are the primary types of brakes available in air brake systems?

Answer: B — Service brakes, parking brakes, and emergency brakes

The primary types of brakes available in air brake systems are categorized into service brakes, parking brakes, and emergency brakes. Service brakes are designed for normal operation and are activated when the driver applies the brake pedal, allowing for controlled stopping during driving. Parking brakes, on the other hand, are used to hold the vehicle in place when it is parked and prevent it from rolling, especially on inclines. They are typically applied manually and can be relied upon to keep the vehicle stationary. Emergency brakes are crucial in instances where the service brakes fail. They are designed to bring the vehicle to a stop in emergencies, ensuring the safety of the driver and others on the road. Understanding these distinctions is essential for CDL holders, as each type of brake serves a specific function within the air brake system, thus enhancing overall vehicle safety and performance in various driving conditions. Other options listed do not accurately represent the core categories relevant to air brake systems.