Revision question · Braking systems

You're about to start a journey in very frosty weather. What's the likely cause of low air-brake pressure?

Revision material from the imported DVSA bank includes source-checked Lanekind learning corrections. These corrections are not newly issued official examination questions, and practice does not reproduce a live test paper.

Answer options

Engine temperature too low

Weak engine anti-freeze mixture

Brake pedal needs adjustment

Frozen moisture in the storage tanks

Show the answer

Frozen moisture in the storage tanksThis was the right answer

Moisture accumulated in an air-brake system can freeze and prevent normal pressure building. Follow the specific dryer and reservoir-drain maintenance schedule. Daily manual draining is not appropriate for every dryer-equipped system; do not set off with unsafe pressure.

Reviewed reading for this question

Match reservoir draining to the fitted air systemReviewed guidance summary · The corrected manual-drain question names the no-dryer system; unfamiliar vehicles require checking, and frozen reservoir moisture can impair pressure build-up.

Loading the questions