Stevie,
In my experience they won't expect you to know absolutley everything about the brigade for which you are applying but at the same time they will expect you to at least have an interest. Do you know how many stations are in the brigade? How many of these are retained? What is the CFO's name that sort of thing, all of these you will probably already know the answers to if you are genuinely keen to join!.
As for why you want to join Dave is absolutley right!, apart from anyhting else if you give them an answer which they think is what yu think they want to hear and not genuine they wil see straight through it!
Are you trying to go WT or RT? an example of the question I was asked was (I should point out here that I'm RT)
'how would you feel if youv'e had a tough day at work, missed lunch, just got home and your tea is put down in front of you and your aleter goes off?'
I mean what the hell did they expect me to say? Overjoyed? I said I'd be pretty pissed off but still respond just as I would at any other time! I am not saying they will definitley ask you these questions but it may be that sort of thing!
Good Luck
