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During our baseline brake testing with the drum brakes, we encountered scary rear brake lock-up. In an effort to reduce lock-up, we tried new wheel cylinders with smaller 7/8-inch pistons (stock was 15/16-inch). Most auto parts stores list the 7/8-inch wheel cylinder application for a '77 Dodge D-100 pickup. They are a bolt-on part that fit the '60s and '70s B-Bodies.