Replace brake fluid is important?

dealer/garage suggest to upgrade my car's service level so that they will replace brake fluid with an extra £100 cost to me?
I had 10000 miles since last service, but that was 3 years ago.
Do I really need to replace the brake fluid? if it is essential, why it is in the top level service, not in the basic level?
many thanks,

所有跟帖： 

• Brake fluid tends to absorb moisture -biglow- ♂ (853 bytes) () 06/03/2010 postreply 08:39:47

• 班頭，借地方問一聲 -滿地找牙- ♂ (84 bytes) () 06/03/2010 postreply 10:18:36

• 看情況 -biglow- ♂ (176 bytes) () 06/03/2010 postreply 11:00:27

• 謝啦。正琢磨買個kit放一次血。我去查顏色先。 -滿地找牙- ♂ (0 bytes) () 06/03/2010 postreply 12:28:31

• Never flush your tramsmission -JunkYarDDo- ♂ (22 bytes) () 06/07/2010 postreply 08:42:09

• Thanks very much for detailed answer. I live in a city that has -CFD-- ♂ (0 bytes) () 06/03/2010 postreply 11:01:10