I was reading up on the service schedule for my 06 DB9 and it says to flush and refill the brake system annually. Is this really necessary? I'v owned alot of cats over the years (never an Aston) and the most frequent recomendation I've seen is every 2 years. Either way I'll do it myself if it absolutely has to be done. Just looking for some feedback on this. Also looking for fluid recommendations.

Thanks