[Damien]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Zman1969</div><div class="ubbcode-body">I replaced a booster and master on a 69 Firebird frt disc car with repo parts, I had to shorten the pin so I shortened the long one first (this way I'd have 2 chances)it had to be shorter than the short pin IIRC I took off over 1/4&quot; gotta love aftermarket parts - sounds like it needs to be a little longer?
when you bolted the master to the booster did you have to push it back to get the nuts started? then the pin would be too long as was my case. you verify the booster is in the correct hole on the pedal? </div></div>

Apologies everyone, I should have added that I did bench bleed the master before installing it.
Zman, I will check the pin length again as it could be the problem even if it hangs the piston open a little. The booster rod is in the correct (bottom) hole in the pedal.