Quote:
Originally Posted by tangofox007
I flushed and filled with Valvoline Synthetic a couple of years ago. My master cylinder started leaking from the rear seal before I could finish bleeding the brakes. There were no signs of a leak prior to that. Couold have been a coincidence. But I won't be switching to synthetic on an older vehicle again.
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I would not call that a coincidence, I would call that luck that you were working on the part when the leak you had reared it's head! the synthetic had NOTHING to do with the leak. it was bad before you started bleeding. synthetic brake fluid is better than the cheap stuff. my cars are all at least 25 years old, and ALL of them get flushed regularly with synthetic. never had any problems this way.