Question 117 of 120

What should you do if, during the air brake check, one trailer in a triples combination fails to hold pressure while the others do?

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Continue the trip since the other two trailers are functioning normally
Treat the combination as not ready to drive until the specific problem trailer is repaired or replaced
Disconnect only that trailer's air line and drive with reduced braking on that unit for the rest of the trip
Ignore it since a single trailer's brakes rarely matter for overall stopping

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Correct answer to question 117 (Doubles/Triples): Treat the combination as not ready to drive until the specific problem trailer is repaired or replaced

Why

A single trailer with failing brakes still reduces the combination's overall braking capacity and creates an imbalance risk, so the problem needs to be fixed before the combination is driven, rather than accepting a partial failure.

Updated: November 2026

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What should you do if, during the air brake check, one trailer in a triples combination fails to hold pressure while the others do?

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