Correct answer
The service brake still works, but the pedal requires more force.
The service brake still works, but without assistance the pedal requires more force. A vacuum booster can retain a reserve after the engine stops; assistance does not necessarily vanish immediately. Other systems work differently. Do not deliberately switch the engine off while moving, and follow the manufacturer’s instructions if a fault occurs.
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The service brake still works, but the pedal requires more force.
The parking brake always stops working.
The wheels automatically lock.
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