What is the primary purpose of caging the brakes on the JLTV?

Caging the brakes on the JLTV serves a critical function in ensuring the vehicle remains operational in specific emergencies, particularly in the event of an air system failure. By caging the brakes, the vehicle's braking system is mechanically locked in a manner that allows it to be towed safely despite the loss of normal braking function. This is essential for recovery operations and ensures that the vehicle can be transported to a location for repair without further risk of damage or hazard to personnel.

This process does not primarily focus on preventing unauthorized vehicle use, facilitating quick repairs of the braking system, or enhancing braking performance while towing. The main intent is to create a situation where the vehicle can still be moved safely under circumstances that would otherwise render it immobile due to braking system failure. Thus, option B accurately describes the primary purpose of caging the brakes.