Which two braking systems are utilized in a Mobile Water Supply (MWS) apparatus?

In a Mobile Water Supply (MWS) apparatus, the correct braking systems utilized are air brakes and hydraulic brakes.

Air brakes are commonly used in large vehicles, including fire service apparatus like the MWS, because they provide powerful and consistent stopping force, which is essential for handling the substantial weight and momentum of these vehicles when they are full of water. Air brake systems use compressed air to apply pressure to the braking mechanism, allowing for effective stopping and better control.

Hydraulic brakes work on the principle of using brake fluid to transmit force from the brake pedal to the brakes. This system is usually found in lighter vehicles, but in the context of an MWS, hydraulic assistance can be employed alongside air brakes for improved performance, especially in emergency situations where quick stopping is critical.

The other choices involve systems that are either not standard for MWS or are less practical. Manual brakes rely on direct physical effort from the driver and are not efficient for the heavy loads carried by an MWS. Pneumatic brakes is a terminology often used interchangeably with air brakes, but it may not encompass hydraulic systems, which are critical in MWS operations. Disc and drum brakes refer specifically to the design of the braking components rather than the overall braking system types used to operate