Which statement about the parking brake is true?

• A. It is activated by first pulling and turning the handle 90 degrees clockwise or counterclockwise
• B. The parking brake will operate partially using the emergency system
• C. The parking brake will not operate if the hydraulic system fails
• D. The parking brake is applied by applying the toe brakes while simultaneously pulling and turning the parking brake handle 90 degrees clockwise

Answer: (D)

The parking brake is engaged through a deliberate sequence that uses both the toe brakes and a specific handle action. You must apply the toe brakes to create hydraulic brake pressure, then pull and rotate the parking brake handle 90 degrees to lock the system. This combination ensures the brakes are actually applying and will stay applied when parked, because the handle’s 90-degree turn mechanically locks the valve to retain the hydraulic pressure in the brake lines.

The other statements miss part of this sequence or describe scenarios that aren’t how this system is designed. One option suggests the handle alone activates the brake, which omits the necessary toe-brake action. The others imply partial operation via an emergency system or a dependence on hydraulic failure, which doesn’t match the described locking action that secures the brakes through the coordinated steps.