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CDifficulty 3/5

What is the function of the drain valves on a pneumatic brake system’s compressed-air reservoirs?

Correct answer

Remove condensate water from the reservoirs.

Remove condensate water accumulating in the reservoirs, following the manufacturer’s maintenance procedure and the installed drainage type. A pneumatic system uses compressed air: it should not contain only liquid, and this is not bleeding bubbles from a hydraulic circuit. The drain valve is also not the semi-trailer supply connection.

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  • Bleed air bubbles from hydraulic brake fluid.

  • Connect the semi-trailer’s pneumatic supply.

  • Remove condensate water from the reservoirs.

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