What is the risk of setting only some of a vehicle's parking brakes, such as just one axle, rather than the full set?
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Correct answer to question 130 (Air Brakes): The vehicle may not be adequately held in place, especially under load or on an incline
Why
Relying on only part of the parking brake system reduces the total holding force available, which can be insufficient to keep a loaded vehicle from rolling, particularly on a grade.
Updated: November 2026