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I'm trying to find a replacement master cylinder gasket. The ones I've seen offered by everyone online have incorrect indent orientations. I purchased the Dorman 42069 gasket, but it didn't fit at all. Pictured is my master cylinder.
Plane, methinks your problems go deeper than a gasket. Your brake system is full of water. Brake fluid does that, absorbs water.
You should bleed all brake cylinders and flush the system. Pull the boots back and look for leaking fluid. If you can't do that, at least suck out the master cylinder with a suction gun or wifey's turkey baster. Wipe the bottom of the master cylinder clean. Repeat it at every oil change.
I suspect you have corroded bores in the wheel and master cylinders.
Good luck.
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