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The rear brake bias is incorrect. They will have a heavy front bias but maybe not as heavy as they would without ABS. There will likely be a proportioning valve to allow a knee in the bias curve so that when there is less pressure applied (less deceleration, less weight transfer) the bias is less forward than when you really stomp the pedal. This is to make better use of the rear brakes when on a low friction surface, when the bias doesn't match the weight transfer.
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1971 911S, 2.7RS spec MFI engine, suspension mods, lightened
Suspension by Rebel Racing, Serviced by TLG Auto, Brakes by PMB Performance
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