Installing Replacement Master Cylinder

Hello All. I'm going to install a new (reman.) Master Cylinder tomorrow on "Matilda" ('78 CJ-7) and am
wondering how important the rubber gizmo on the end of the push-rod that "snaps" into the recess in the piston is. The replacement M/C didn't come with a new one and the old one looks a little frapped out but may reinstall just fine. I just want to make sure that it's not critical to prevent the piston travel geometry from being tweaked out and causing uneven wear to the cylinder bore. Maybe I worry too much about some things. Yes? No? Thanks for any input, advice, suggestions. Regards, -K-

 

Are we talking about the rubber boot that covers the push rod? If so I think its just to keep the push rod clean and free from dirt/dust and anything else that makes it into the tub. I just replaced my MC and the boot was a little torn, but reused it anywho.

 

The actual part in question is on the end of the push-rod that is inserted
into the recess in the M/C piston end. Thanks for any help.

 

Oops, guess that wasn't much help, sorry I have no idea what that is called (gromet or maybe bushing). Thinks its there to help reduce wear of metal-metal contact on the pin when applying the brakes.

 

No worries. That is helpful, and you're most likey correct that they used the rubber bushing (or whatever it is) to prevent mechanical abrasion and maintain the correct orientation.

 

without seeing its hard to make a call. but guessing, i think your refering to the soft rubber boot at the end and its just a dust cover.