this release brg has been working in there for how long now; 100,000 mi.?.thinks do wear out. there is more than 1 place for wear in this setup and you can lose quite a bit in linkage wear. if trhe clutch disc is worn out , one should always replace th p/p at this time as it's surface also wears and it doesn't necissarily wear flat and springs can loose tension..the biggest PITA is replcing it after you find out that it isn't as good as youi thought it was.there are 2 different depths of t/o bearings depending on style of p/p. whether or not that it is a diaphram or 3 finger setup
don't be cheap as it will more than likely cost you more in the end
ron