Ive just replaced my old booster which worked well with a used Delco Moraine booster with the gold anodizing.Ive adjusted the pedal to the same play as before but this booster doesnt work well at all.I have to push really hard to stop now.Are there any other adjustments or do I just have a bad booster?

In my parts interchange book is shows not all boosters work with all mc's. Is your old booster (the working one) a Delco Moraine?