What is the purpose of having more than one reservoir in a braking system?

The purpose of having more than one reservoir in a braking system is to provide a larger reservoir air volume. This is critical because a larger air volume allows the braking system to maintain consistent and effective braking power. When a vehicle's brakes are applied, the system needs a sufficient amount of air pressure to operate effectively. By having multiple reservoirs, the system can store more compressed air, ensuring that there is enough supply to accommodate various braking demands without running out of air pressure. This also enhances the reliability of the braking system, particularly on larger vehicles that require more forceful braking actions, as well as during prolonged or heavy braking scenarios. In addition, multiple reservoirs can help maintain air pressure when one reservoir may be depleted or underperforming, which adds a layer of redundancy and safety to the braking system.