Originally Posted by IFixPlanes
Do not mix up "emergency" brake system with "alternate" brake system.
True. However alternate would refer to using system pressure and emergency to using accumulator pressure. Both of which, on any Airbus, is selected automatically.
I would imagine the question in post #1 is part of a specific syllabus which uses a specific aircraft or manufacturer as reference. This often the case and questions which appear general in nature are then often not.