Booster pin to MC distance

[rohrt]

I got my MasterPower check tool and found my pin is ever so slightly engaging the MC. How imperative is the .020 gap? Will this cause the front brakes to drag.

I ground down the pin too much the first time and have a small washer as a spacer behind the MC pin. With the washer out I had way to much gap and a brake pedal that would stop ok but could push to the floor.

https://static1.pt-content.com/images/pt/2015/07/20150711_091237_zps619hewwh-1.jpg

https://static1.pt-content.com/images/pt/2015/08/20150807_143059_zpswsx4ldla-1.jpg

https://static1.pt-content.com/images/pt/2015/08/20150807_143109_zpsi9i8xzba-1.jpg

[dontlifttoshift]

.020" - .025"

If it is engaging the master cylinder at all, the brakes will drag.

[rohrt]

Thanks Donny.

I will do some more grinding.

[rohrt]

Does the O-ring on the booster pin server any function? Is it just to keep the pin from falling out or does it seal anything?

I pulled two pins from junk cars. One was from a 77GP and the other from a 69 Pontiac Catalina. Bother were exactly the same but no O-ring like mine.