Power brakes function only when the engine is running
The power brakes utilize vacuum pressure which is only created when the engine is running. Never let the vehicle roll to a stop with the engine switched off.
If the power brakes are not working, considerably higher pressure will be required on the brake pedal to compensate for the lack of power assistance. This can happen for example when towing your vehicle or if the engine is switched off when the vehicle is rolling. The brake pedal feels harder than usual.
See also:
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Standby mode due to action by the driver
ACC is temporarily deactivated and put in standby mode:
when the brakes are applied
if the driver's seat belt is taken off
If the driver's door is opened
if the gear selector is move ...