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I have rust forming around the rubber seal on the m/cyl and it's wet around the outside? Any suggestions? This is a CPP Power Disc system.
 

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the gasket is shot or pinched, tore.... etc.... dot3 fluid adsorbs water ... so it will rust the iron housing when it leaks.......
 

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Brake fluid should changed approximately once a year due to moisture accumulation (depending on the type of fluid you use). We have a couple Benz and it says in the maint manual to change it yearly. The non-dealer mechanic I use verified it's true. For years I never changed fluid in my cars but the rust can ruin brake calipers, master cylinders etc.
 
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