Should Drum Brake Cylinders Be Replaced in Pairs?

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Replaced the left rear rear (LRR) cylinder a few months back. Now, it appears the left rear front (LRF) cylinder is shot. Coincidence? Should they be replaced in pairs?
 
The reality is that once one goes, it's probably time to replace them all. Then you can do the work once, and know it's done right. It also means you'll likely never have to mess with it again. The cylinders are not that expensive, and it's roughly the same amount of tear down to do one or two.

I'd plan a Saturday and do them all.
 

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