When to bleed brake?

How do you know when it's time to bleed brakes?
I've had my Juicy 5s for just over a year. There is now more travel in the levers than when first bedded in although there is no apparent fade.
I assume the fluid absorbs moisture over time like automotive brakes and needs replacing.
When?
I've had my Juicy 5s for just over a year. There is now more travel in the levers than when first bedded in although there is no apparent fade.
I assume the fluid absorbs moisture over time like automotive brakes and needs replacing.
When?
Cotic Soul 26 inch. Whyte T130
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Parktools :?:SheldonBrown