Torn caliper piston dust seal
#3
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Join Date: Oct 2006
Location: NAPLES, FLORIDA
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The dust seal does precisely what the name suggests. It is not there to retain fluid. An indication of fluid under the seal does indicate a piston seal is defective. If the seal is torn from old age it is wise to rebuild/replace the caliper. Don't forget to flush the brake system, and check the hoses.
#5
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You will eventually get enough moisture and durt in the piston wall to score the the surfaces. Sometimes enough scoring to not be able to hone out, and eventually leak fluid..