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Correct!

Your vehicle is fitted with air-assisted hydraulic brakes. What fault would you suspect if the brake pedal becomes hard to press?

The brake system has a loss of air pressure
Correct answer
The brake linings are worn
The brake shoes need adjusting
The brake system requires more fluid

DVSA theory test explanation

A fault in the air compressor could be the cause of a stiff brake pedal. There could also be a leaking connection allowing air to leak out of the compressed air system. Do not continue your journey until the fault has been fixed.

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