Get the rebuild kits and go at it. They are very straight forward to do. You will need an air compressor to "pop" the cylinders out. While you are at it clean out the resevoir on top of the master cylinder real good, you won't believe the crud that can get in there over the years.

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If it ain't broke take it apart and find out why.

1983 300SD, 4 speed
1994 C280
1987 300TD wagon
1996 HD Road King

Ride in Peace Eric Peterson, Harley of Macon