Double Diaphragm Booster Fitted
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With the double diaphragm booster fitted, and with the vacuum back at 17 inches with the motor at idle, the rear brakes showed almost 700 psi. A huge improvement! This compares well with Classic Performance Products' own specs which state that a dual diaphragm 7-inch booster with 23 inches of vacuum will provide 175 psi of 'free pressure' (the pressure the booster can provide, as opposed to 'manual pressure', that exerted manually on the pedal without the booster) with 100 lbs weight applied to a pedal with a 7:1 ratio and a 1-inch bore master cylinder. View Related Article
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