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Incorrect!

You're about to drive a vehicle fitted with air-assisted hydraulic brakes. Why might the brake pedal feel hard when you press it?

The air compressor is not working
Correct answer
The pedal movement needs adjusting
The brakes are locked on fully
You selected this answer
The brake-fluid reservoir is empty

DVSA theory test explanation

If the brake pedal is hard to press, this could mean a loss of air pressure or a fault in the air compressor. You should not drive the vehicle until the fault has been repaired.

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