Skip to main content
TEST PREP
Start

BC Air Brake Practice · Question

Scenario 19: An emergency application of the trailer brakes happens automatically when:

Loss of supply-line pressure triggers an automatic emergency application of trailer brakes via the relay/emergency valve. The correct answer is "The emergency (

Start free practice for BC Air Brake Practice

40 questions · no signup required · 40 free questions per day

Start Practice →

Question: Scenario 19: An emergency application of the trailer brakes happens automatically when:

Answer options:

  • Engine RPM is too high ✅ The emergency (supply) line loses pressure (e.g., line break or disconnected glad-hand)
  • The driver shifts gears
  • Headlights are turned on

Correct answer: The emergency (supply) line loses pressure (e.g., line break or disconnected glad-hand)

Explanation: Loss of supply-line pressure triggers an automatic emergency application of trailer brakes via the relay/emergency valve. The correct answer is "The emergency (supply) line loses pressure (e.g., line break or disconnected glad-hand)". This capacity-fill scenario 19 reinforces the same competency for the airbrake bank and follows the certified explanation standard.

Start free practice for BC Air Brake Practice

40 questions · no signup required · 40 free questions per day

Start Practice →

More about BC Air Brake Practice

Related Questions

More for BC Air Brake Practice candidates

Ready to practice?

Free, no signup required. Build a wrong-question list as you go.

Start Free BC Air Brake Practice Practice →

Related courses

Other Canadian certifications candidates often prepare for alongside this one.