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ASE T4 Truck Brakes PrepQuestion 6 / 10

The dash-mounted parking brake control valve has full air pressure, but the parking brakes won't release. Technician A says to check for a damaged delivery line between the valve and the spring brake chambers. Technician B says to check if the spring brake chambers are frozen due to moisture. Who is right?

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✓ Correct answer: C. Both A and B Both are correct. A damaged delivery line would prevent air pressure from reaching the spring brake chambers to release them. Also, if moisture has frozen in the spring brake chambers, it could prevent them from releasing even with proper air pressure.

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