Type 3 brakes are designed to hold apparatus at what incline?

Type 3 brakes are specifically designed to effectively hold apparatus on inclines up to 20%. This capability is crucial for firefighting and emergency response vehicles, as they often operate in varied terrain and need reliable braking systems to ensure safety and stability when parked on slopes.

A 20% incline translates to approximately an 11.3-degree slope, which poses significant challenges for vehicle stability and control. The engineering behind Type 3 brakes allows them to resist the forces that would otherwise cause the vehicle to roll back or move unexpectedly, ensuring that the apparatus remains securely in place during operations, such as when firefighters disembark to respond to an emergency. This design consideration is essential in maintaining safety standards and operational efficiency in the field.

The other incline percentages represent challenges that exceed the designed capabilities of Type 3 brakes, making option C the correct choice based on their intended functionality.