With the main work done under the car, we turned our attention to what needed to be done underhood. In addition to drums, our El Camino also had manual brakes, not a great combination. We removed the stock master and replaced it with this 11-inch power brake booster and master cylinder combination. Like the front spindle, this came fully assembled from CPP and included all the brake lines to plum in the new proportioning valve. The larger booster was a tight fit but it cleared the big-block valve covers, inner fender, and windshield wiper motor.