kellyavanti Posted June 4, 2021 Report Share Posted June 4, 2021 Looking for a replacement brake booster, dual master cylinder combo for my Avanti. I'm wondering what bore master cylinder, since I'm going to a tandem. I typically use speedway auto for stuff like this. Link to comment Share on other sites More sharing options...
brad Posted June 4, 2021 Report Share Posted June 4, 2021 Stock was 1 1/16" but as you go smaller, the line pressure increases, and the stroke increases also. A larger bore gets quicker pedal action, a smaller bore applies more force for less effort. I had a 15/16" on mine with a stock booster, and a Mopar 4 to 2 mounting adapter. It worked extremely well. Link to comment Share on other sites More sharing options...
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