Can't find my AIM, reassembling master cylinder to booster. There is a shiny new pushrod that has an o-ring on one end. Does that o-ring go into booster or into master cylinder. I'm guessing booster, right or wrong.
Thanks
rj

fond my answer on David Pozzi's site, looks like the o-ring goes into the booster to preserve vacuum. Does that o-ring need any lube of any sort?
RJ