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Message: <blockquote data-quote="Richard L" data-source="post: 538050" data-attributes="member: 52972">Yardsdale,if the caliper bore is rusted and pited the piston will be forced out by the hydrolic pressure, however the corrosion in the bore will not allow the piston to retract fully.  This causes the pad to constantly drag and wear.  As the pad wears the piston is for out further but still cannot retract enough to prevent the constant dragging.  The best solution is to replace both calipers with rebuilt units.  Often times the caliper bore is too badly pitted to just use a rebuilding kit, and frankly it's just easier and cheaper to just buy rebuilt calipers rather than attempt to rebuild them.  I recommend replacing both since the usual case is that, If one is bad the other is not too far behind.I usually just replace the calipers with rebuilt units everytime I replace the front brake pads (usually about every 50K miles)....Rich</blockquote>