I ordered all of my school buses with Lucas Girling brakes. I liked them. They can be a bear to repair if someone has messed with it or there's been a fire. They are also expensive if they haven't been maintained. Keep fluid in the belt driven pump. It's an expensive sucker to replace. I still remember the sting of the last one.
The truck has multiple brake systems. It is hydraulically assisted hydraulic. The pump on the left side of the engine supplies power to the hydraulic assist when the engine is running. If you step on the brakes with the engine off or it stalls, a 12 volt motor under the master cylinder kicks in and supplies the pressure the pump usually does. Those boost the regular brakes (like vacuum does on a car). They also supply pressure to the dash switch to set the parking brake. They are a lot like air brakes in that having the park brake set means there is no pressure in the system. When you release it (pull the lever down) it pumps the system full of that ATF to unlock the rear brakes.
You can "cage the brakes" by turning the bolt on the end of the chamber at each rear wheel behind the axle. Be very careful. What you are doing is compressing a large spring that has enough energy to kill you and a small elephant.
If you cage them you can move it but you won't have power brakes without that system in place. That motor will also kick in as it will sense a low pressure situation. It isn't just a wiper motor (even though it looks like it). That thing will drain batteries fast. It will run nonstop. Off road or not, you are going to have to get that system up and running.
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Today's Featured Article - Gatherin of the Orange - by Rick Nikolich. In July of 1998 I was talking to fellow Allis Chalmers collector Mike Schilling about the annual "Gathering of The Orange" AC show coming up in August of 1999. He got this wild idea that we should get a convoy of AC tractors and drive them from Charlotte, Michigan 105 miles to LaGrange, Indiana.
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