You can mount the master cylinder in the truck and attach the brake pedal linkage and follow the "bench bleeding" procedure as described by D'Ecosse in the above post. Pressing the brake pedal slowly and watching for all the air bubbles to disappear. Then remove the plastic plugs, attach the steel brake lines and then bleed the entire system. This method has worked great for me many times, especially when the master cylinder is mounted under the floor. If the master cylinder is mounted on the firewall you will need an assistant to slowly press the brake pedal while you are tending to the master cylinder on the firewall. An old time mechanic taught me to do it this way.
