Practice question

What is the function of the pneumatic link between the units of a combination?

  1. To drain condensation from fuel tanks
  2. To join the pneumatic brake mechanisms of the towing and towed road vehicles into one system
  3. To inflate the trailer tyres from the cab
  4. To power the tractor's steering pump

Answer: B — To join the pneumatic brake mechanisms of the towing and towed road vehicles into one system

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