A minimun of every two years and yearly if I can. Besides replacing the seals in the calipers and master cylindars, also replace the pistions in both.
Do you find that they let go? If they don’t leak do you leave them alone or do you do them as a precaution?
I flush the fluid ever 3 months or so and only rebuild if somethings leaking. I found keeping the fluid clean prevents problems.
Brian
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