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I don't know the answer to that. It would be mostly dependent upon the specific gravity of the oil. If the oil is heavier, it would continue to migrate down to the lowest point in the system. If the oil floats on top of the brake fluid, it may never migrate deeper.
Test it out and see...
Randy,
I really appreciate all the help and advice. From all the research I can find, brake fluid has a higher specific gravity. I'm going to do the physical test in a few minutes to confirm. Hopefully I'll be able to fix the problem with a master cylinder/reservoir swap and reverse vacuum flush.
Yes brake fluid has a higher SPG, which is why I asked about how long. Look at the reservoir, has the ATF stratified only on the top with some reserve of brake fluid above the body of the M/C? If so you can use a pry bar to lift off the reservoir after siphioning as much of the materiel in the reservoir as possible. There have been instances where people can get the fluid out, pull the reservoir, then just clean it out.
For a shop they will replacing everything due to insurance liabilities - they have to. You might be lucky enough to just clean the reservoir, or replace the M/C.
Brake system fixed. Will be checking components periodically for the next few weeks just to be on the safe side. Thanks for all of the help and advice from everyone who contributed!
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