It can leak internally but not externally, rare but I seen it once.
Suck out all of the fluid in the reservoir and replace it with new fluid. Bleed your brakes to get the new fluid in and past the M/C. This will remove all the moisture soaked brake fluid and you will see if you get a better brake pedal, if it is still bad replace the M/C and do a complete brake fluid flush to all 4 wheels to remove all bad contaminated fluid.
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Mark V
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1998 Explorer 4.0 SOHC
1998 Windstar GL 3.8
2001 Corvette Coupe 6 Speed
2006 Honda Shadow Spirit 750 http://public.fotki.com/snextime/
If your Exhaust tip is bigger than your cylinder bore, you are a Ricer!
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