Our '68 had manual brakes, and with a 496ci big-block making a meager 10 inches of engine vacuum on a good day, we wanted to stay away from vacuum-boosted brakes. CPP does offer brake booster kits and hydroboost systems, if you feel so inclined. Removal of the old master is straightforward: loosen the two fluid lines with a tubing wrench, and unbolt the two nuts holding the master on the firewall studs. Some cars may have a snap ring and a washer retaining the pushrod inside the master. If it does, you will have to remove the pin holding the pushrod fork to the brake pedal, and pull the pushrod out through the firewall when removing the old master.