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I've had mixed results with rebuilding these type cylinders. It would depend on the quality of the rebuild kit, and the condition of the bore. If the bore itself is shot, then no rebuild kit is going to make it work right. It's just like doing an engine, new rings won't fix deep cylinder wall gouges or rust pits. Honing is a "good thing", but it's real easy to go too far and get the bore so large the rubber seals won't make good contact any more (been there, done that). The condition of the rubber in the rebuild kit is pretty critical, and I've had it vary widely. I've had kits where the seals were deformed right out of the box (NAPA, frustratingly enough was the worse at this). Others where the seals where of good form, but of extremely poor quality rubber that disolved itself in a few months. Interestingly, it was the master cylinder rebuild kits that were the worse. Wheel cylinder kits usually didn't have this problem. Go figure. Remember, the air rises in brake fluid, so before you go killing yourself attempting to bleed down low at the slave cylinder, do so where the line attaches to the master cylinder first.
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