What are the two types of braking systems in commercial vehicles?

Service brakes and emergency brakes are the two primary types of braking systems found in commercial vehicles. Service brakes are the standard braking system that drivers use to slow down or stop the vehicle during regular operation. This system is designed for frequent use and is crucial for safe driving in various conditions.

Emergency brakes, also known as backup brakes or spring brakes, serve as a secondary system that is activated in case the primary service brakes fail. They are particularly important for ensuring that the vehicle can be brought to a halt safely during emergencies or when the vehicle is parked. Emergency brakes are often designed to engage automatically when the vehicle is turned off or when a specific lever is pulled, providing additional safety measures.

The effective combination of these two braking systems enhances overall vehicle safety and performance, enabling drivers to manage their vehicles more effectively under different scenarios. The other options do not accurately reflect the standard terminology used in the context of commercial vehicle braking systems.