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,

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Brake fluid tends to absorb moisture -biglow- 给 biglow 发送悄悄话 biglow 的博客首页 (853 bytes) () 06/03/2010 postreply 08:39:47

班头,借地方问一声 -满地找牙- 给 满地找牙 发送悄悄话 满地找牙 的博客首页 (84 bytes) () 06/03/2010 postreply 10:18:36

看情况 -biglow- 给 biglow 发送悄悄话 biglow 的博客首页 (176 bytes) () 06/03/2010 postreply 11:00:27

谢啦。正琢磨买个kit放一次血。我去查颜色先。 -满地找牙- 给 满地找牙 发送悄悄话 满地找牙 的博客首页 (0 bytes) () 06/03/2010 postreply 12:28:31

Never flush your tramsmission -JunkYarDDo- 给 JunkYarDDo 发送悄悄话 (22 bytes) () 06/07/2010 postreply 08:42:09

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

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