What would be the cause of no air pressure in the secondary reservoir with full pressure in both the supply and primary reservoirs on a typical heavy-duty truck with a dual circuit... What would be the cause of no air pressure in the secondary reservoir with full pressure in both the supply and primary reservoirs on a typical heavy-duty truck with a dual circuit air brake system?
Understand the Problem
The question is asking about a specific issue in a dual circuit air brake system of a heavy-duty truck, specifically regarding the reason for the lack of air pressure in the secondary reservoir while full pressure exists in the supply and primary reservoirs. It requires knowledge of air brake systems and their components to determine the correct cause from the provided options.
Answer
A defective one-way check valve.
The final answer is A) A defective one-way check valve.
Answer for screen readers
The final answer is A) A defective one-way check valve.
More Information
A one-way check valve prevents backflow of air between reservoirs. If defective, it could result in no air pressure in the secondary reservoir despite full pressure in the supply and primary reservoirs.
Tips
A common mistake is not understanding how a check valve works and its critical role in isolating air pressure between circuits.
Sources
- The anatomy of a truck's air brake system | Commercial Carrier Journal - ccjdigital.com
- No air pressure in secondary tank - TruckersReport.com - thetruckersreport.com
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