Practice question

What is the function of the 'air suspension dump valve' (purge de suspension pneumatique) on a heavy semi-trailer?

Exhausts air from the trailer air suspension bellows to lower trailer deck height for loading dock alignment or ferry boarding
Dumps engine oil into the fuel tank
Discharges compressed air into the cabin for air conditioning
Drains water from the windshield washer bottle

Answer: A — Exhausts air from the trailer air suspension bellows to lower trailer deck height for loading dock alignment or ferry boarding

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