Correct answer
To help control speed and relieve the service brakes when its use is appropriate.
To help reduce and control speed while reducing the thermal load on the service brakes. Its use is not necessarily limited to descents, and it does not replace the parking brake or every service-brake application. Select appropriate intensity and combine the systems when indicated by the manual; there is no requirement to always alternate them. Grip and conditions constrain its use: avoid inputs that could cause loss of control.
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To hold the vehicle stationary instead of using the parking brake.
To help control speed and relieve the service brakes when its use is appropriate.
Only on descents, even if the manufacturer permits its use in other situations.
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