Toyota HILUX Owner's Manual page 417

416
7-1. Essential information
CAUTION
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If the engine has to be turned off while driving
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Power assist for the brakes and steering wheel will be lost, making the
brake pedal harder to depress and the steering wheel heavier to turn.
Decelerate as much as possible before turning off the engine.
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Never attempt to remove the key, as doing so will lock the steering wheel.