I don't have a drawing, but I believe you have air over hydraulic brakes. If you are not building air pressure try adding air to the air system through the service center at the rear of the MH. You can use a air compressor to add the air and release the brakes, but you will need to find out why you are not building pressure before you drive it more than a few feet.
1998 Beaver Patriot Savannah
330 hp Cat 3126 DP