Do you have what it takes to PASS the BUS theory test?

Put your skills to the test by answering this example theory test practice question.

This DVSA BUS practice question has been taken from the Braking Systems theory test topic.

Select one answer

What could prevent air pressure from building up in an air-brake system in frosty weather?

Moisture in the air may form bubbles in the brake fluid

The air will contract, reducing the pressure

The dampness may cause valves to rust

Moisture drawn in with the air may freeze and cause a blockage

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