Measure and record the length of the pedal pushrod between the brake pedal clevis and the rear face of the booster.ģ. Pry the bracket off the booster with a screwdriver.Ģ. Locate a 1967-1972 A- or F-body booster, and grind off the rivet heads that hold the firewall mounting bracket to the booster. The G-body booster can be modified to the hybrid configuration shown in the photo, allowing it to fit the early A-body (intermediate) or F-body (Camaro/Firebird):ġ. ![]() However, commonly available late-model units (such as the 1982-1988 G-body, code "FB," GM 18010120) typically have a different firewall mounting angle and brake-pedal attaching rod than the early unit. To achieve peak performance with such systems and a modern, high-tech look, it’s best to install a late-model dual-diaphragm power booster. Retrofitting late-model four-wheel disc brakes to classic GM musclecars is gaining popularity. ![]() The following information appeared in the July 1996 issue of Car Craft Magazine and should only be used as a resource for performing this modification to your vehicle. Dual Diaphragm Booster Mods Dual Diaphragm Booster Upgrade
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