the little rubber piece thats on the end of the master cylinder pushrod?

inertia said

Snip a small piece of 1/4 vacuum tube off your vacuum cannister or p/brake, or washer bottle.

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Don’t do this. Buy the correct piece from Dr Diff. You will have a hard time removing the pushrod next time around. The correct piece has a notch in it so it will come out.

Mopar Manual Brake Push-Rod Retainer, Bushing, Clip Rubber Grommet