Question 8 of 120

During the air brake check, the last trailer in a triple combination does not release after the supply line is charged. What should you do?

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Drive slowly since the other units still have brakes
Tap the brakes a few times and continue the trip
Disconnect only that trailer and continue with the rest, since the others still have working brakes
Do not drive the combination until the problem with that trailer's brakes is found and fixed

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Correct answer to question 8 (Doubles/Triples): Do not drive the combination until the problem with that trailer's brakes is found and fixed

Why

A trailer whose brakes won't release signals a real air system fault; the whole combination should stay parked until that trailer's problem is fixed, not just driven around or disconnected mid-trip.

Updated: November 2026

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During the air brake check, the last trailer in a triple combination does not release after the supply line is charged. What should you do?

Why

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