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replacement brake booster?

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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.

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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.


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