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Which preparation precedes a headlamp aim check?

  • A.Correct tyre pressures, level floor and normal load
  • B.A full fuel tank only, which ensures that the vehicle sits at the attitude assumed by the aiming specification
  • C.Nothing
  • D.Setting the levelling control to its zero position, which is required before the aim of the lamps may be adjusted

Answer: A

Attitude governs aim, so pressures, suspension condition and load are all checked first. Setting the levelling control to zero genuinely is part of the procedure, which makes the last option a real step within the same preparation. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Tracing the requirement back to the physical constraint that produces it makes the answer follow. The quantity that varies and the quantity that does not are worth naming before any substitution is attempted.

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