Practice question

Under national standard GB 7258-2017 (Technical Conditions for Motor Vehicle Operation Safety), at what minimum air pressure threshold must the low brake pressure warning buzzer and lamp activate?

  1. When air pressure in the service brake reservoirs falls below 0.45 MPa – 0.55 MPa (4.5 – 5.5 bar)
  2. When air pressure drops below 0.10 MPa (1.0 bar)
  3. When air pressure exceeds 1.20 MPa (12.0 bar)
  4. When air pressure reaches 0.80 MPa (8.0 bar)

Answer: A — When air pressure in the service brake reservoirs falls below 0.45 MPa – 0.55 MPa (4.5 – 5.5 bar)

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