I second the flush idea. It happened on my Corvette once. Over the years, if the system isn't flushed, moisture can build up and foul the components. You might also suddenly find yourself with no brakes after some "spirited" driving when the water laden brake fluid boils in the calipers.

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-Evan


Benz Fleet:
1968 UNIMOG 404.114
1998 E300
2008 E63


Non-Benz Fleet:
1992 Aerostar
1993 MR2
2000 F250