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C1Difficulty 3/5

A lorry pulls to one side only when braking. What functional imbalance could explain this behaviour and requires inspection?

Correct answer

Unequal braking effectiveness between wheels on the same axle.

Unequal braking effectiveness between wheels on the same axle can produce this pull. The symptom alone does not identify the failed part: inspect brakes, tyres and other components as appropriate for the design. It cannot be attributed always or usually to different pressures without diagnosis. If control is compromised, stop safely and arrange inspection before continuing; do not improvise adjustments to mask the symptom.

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All options

  • Unequal braking effectiveness between wheels on the same axle.

  • Perfectly balanced braking as a sufficient explanation.

  • Washer activation as the direct cause of unequal braking.

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