"I hope you replaced both rear wheel cylinders or you may be in for another surprise. If you only replace one side, the increased pressure is likely to make the other side fail."
Didn't actually have to replace any parts - just a complete teardown, cleaning, and reassembly. The wheel cylinders were actually relatively new, so the seals and boots were in good shape, and didn't suffer cuts or abrasions from the incident. There were some dings in the cylinder wall from the butt end of the pistons, but this is at WAY beyond normal range of travel, so I don't expect any problems.
However, I don't see how replacing one cylinder would cause higher pressure, nor make the other one more likely to fail. Maybe purging the lines with new fluid would cause a problem by reducing unwanted 'resiliency' in the system.
'91 MB 190E 2.3
'08 RAV4 Ltd 3.5
'83 Lazy Daze m'home 5.7