1" master cylinder rebuild kit alternative

If you can find a tap the right size you might be able to cut some threads in the hole of the piston and pull it out that way.

Like pressing out lower control arm bushings but in reverse

I had a drum drum MC. That was solid with dried fluid.

I tried soaking it, you name it.

I finally carefully drilled out the front piston and got all the crap out, but the rear piston was too far in for my tools so I said hell with it.

I ended up cutting the mounting flange off and use it to do environmental testing on the bellows retainer gasket that I make.

You win some you loose some