Revision question · Braking systems

On a vehicle with air-assisted hydraulic brakes, which assistance fault could make the pedal unusually hard to press?

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

The air-assisted hydraulic booster is not working properly

The pedal movement needs adjusting

The brakes are locked on fully

The brake-fluid reservoir is empty

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The air-assisted hydraulic booster is not working properlyThis was the right answer

Loss of the booster’s assistance can require much greater pedal effort. Air leaks, supply or control faults are possible; a hard pedal does not uniquely diagnose the compressor. Report it and do not drive until the braking fault is assessed and repaired.

Reviewed reading for this question

Treat lost air assistance as a braking faultReviewed guidance summary · The primary technical source is explicitly air-over-hydraulic, not an unrelated vacuum servo.Do not move with unsafe brake-air pressureReviewed guidance summary · The primary technical source is explicitly air-over-hydraulic, not an unrelated vacuum servo.

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