If you have a Ford chassy, you add fluid to the master cylinder located behind the brake pedal. The operating rod off the brake pedal goes down through a rubber cover over the mouth of the master cylinder. It is hard to reach this and hard to put fluid in. I purchased a power brake bleeding system to work on the brake system and I use it to put fluid in. A small squeez bottle will work. The vaccum booster is located on the frame rail behind the left front wheel. It is probably a hydravac booster. Do you have a air over hydraulic system as well as boosted vaccum? This is an addational brake system using coach air pressure to operate brake system. You will have a hand valve next to the steering wheel.
James
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