That time my neighbor swore by ATF in the brake system, what a mess

My neighbor Jerry, who's been wrenching since the 70s, told me to add a little automatic transmission fluid to my 74 Chevelle's brake fluid to soften up a stiff pedal. Said it was an old trick. I tried it last Saturday, and now my master cylinder is leaking like crazy and my seals are toast. Cost me $140 for a new one plus rebuild kit for the wheel cylinders. Should've just bled the system like I planned. Has anyone else heard this hack and actually had it work, or did I just get Jerry's worst advice yet?

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