What's most likely to cause a crash, if it's allowed to get too low?
- A Anti-freeze level
- B Brake-fluid level
- C Battery electrolyte level
- D Radiator coolant level
Why this is the answer
You should carry out frequent checks on all fluid levels. The brake-fluid level will fall as the friction material on your brake shoes or pads wears down. If it falls below the minimum mark on the fluid reservoir, air could enter the hydraulic system, and this will lead to loss of braking efficiency.
Why the other answers don't fit
- A
- Anti-freeze level — Low anti-freeze risks a frozen engine, which is a breakdown rather than a crash.
- C
- Battery electrolyte level — A flat battery leaves you unable to start.
- D
- Radiator coolant level — Low coolant overheats the engine and stops it; the brakes are what stop the car.
Where this comes from
- Driving: the essential skills — section 14
- The Highway Code — page 150
Rule numbers link to The Highway Code on gov.uk.
Where this question comes from
The question, its options and the explanation are reproduced word for word from the DVSA revision question bank under licence. The licence requires them to appear unaltered, so we cannot reword them and neither can anyone else — that is why you will meet the same wording on other sites. Everything else on this page is written by Theory Hub: the explanation of why each wrong answer is wrong, the topic guide and the revision notes.
Asked in: Driving Instructor (ADI Part 1)
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