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A ____ air brake endorsement is required on a driver's licence to operate any air brake equipped motor vehicle.

  1. F

  2. R

  3. S

  4. Z

The correct answer is: Z

The requirement for a "Z" air brake endorsement on a driver's licence is in place for individuals who wish to operate any motor vehicle equipped with air brakes. Air brakes work differently than hydraulic brakes; they utilize compressed air to apply the braking force, making it crucial for drivers to understand how to operate them safely. The Z endorsement signifies that the driver has completed the necessary training and testing related to air brakes, ensuring they are aware of the systems' specifics, including operation, inspection, and potential issues that may arise. Thus, the presence of this endorsement on a driver's licence demonstrates that the individual is qualified and capable of handling vehicles with this type of braking system safely.