what i would do is like jeff says, repace the linings because you will not get the oil out of them. i would also do this. inspect bearings, replace if needed. replace seals, replace wheels cylinders or have them lined and add new kits. new linings. since id be working on the rear i would also replace the brake hose and all brake lines. it will cost you money but when your done everything associated with the rear wheels has been addressed once and done. no sense in chasing one componet at a time when it fails and having to keep going back to replace or repair. the latter will cost more in money, frustration and time.
