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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.

The real exam in English is a translation of the Spanish original; compare both here.

Show the Spanish original

¿Cuál es la función de las válvulas de purga de los depósitos de aire comprimido del freno neumático?

  1. Eliminar las burbujas de aire de un líquido de freno hidráulico.
  2. Conectar la alimentación neumática del semirremolque.
  3. Extraer el agua condensada de los depósitos.(Correct answer)

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