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RE: every two years?
Brake fluid is hydrophilic (attracts/absorbs water). This is good because it keeps water from getting in the lines near the calipers and creating steam when you brake hard. (...creating a sudden loss of braking...)
The downside is that after a while, especially the fluid near the calipers, contains an increasing amount of water -- thus, it can cause corrosion in the calipers. Enough corrosion and you have to replace them.
If your brake system is in essentially good condition, then replacing the fluid every two years is seen as a Lot cheaper than replacing your calipers.
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James
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