Practice question

What dangerous mechanical phenomena occur if a bus driver continuously rides the service foot brake on a steep mountain descent for extended periods?

  1. Instantaneous bursting of the cooling radiator hoses
  2. Brake thermal fade (制动器热衰退) and depletion of pneumatic air pressure (气压衰减), leading to complete service brake failure
  3. Sudden reverse rotation of the drive axle
  4. Immediate overcharging of the 24V vehicle battery

Answer: B — Brake thermal fade (制动器热衰退) and depletion of pneumatic air pressure (气压衰减), leading to complete service brake failure

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