Practice question

Why must air storage tanks in an air brake system be drained daily?

  1. To refill the engine coolant system
  2. To remove accumulated water and compressor oil that can freeze or cause brake valve failure
  3. To increase the weight of the truck
  4. To release excess fuel vapors

Answer: B — To remove accumulated water and compressor oil that can freeze or cause brake valve failure

The correct answer is shown above. Try the full quiz for additional practice.

Practice more: HTV Driving Theory Practice Questions - Pakistan Driving Licence Theory Test - Heavy Transport Vehicle (HTV) Exam →