What happens when the dash-mounted parking

Multiple choice — select the best answer

AThe relay valve directs air to the quick release valve
BThe spring brake chambers lock mechanically in their current position
CAir is exhausted from the spring brake chambers
DCompressed air is sent to the service brake chambers

✓ Correct answer: C. Air is exhausted from the spring brake chambers When the dash-mounted parking brake control is placed in the applied position, it exhausts air from the spring brake chambers. This allows the power springs to extend and apply the brakes mechanically through the push rods.

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What happens when the dash-mounted parking brake control is placed in the applied position?

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