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I replaced the master cylinder on my 1986 F150 regular cap 5.0 last weekend. After bleeding the brakes RR, LR, RF, LF I took it for a test drive and the pedal sounds like it is bleeding air. Everything that I can find indicates that the booster is bad (vacuum line is pulling a strong vacuum when running). I removed the master cylinder from the booster, removed the 4 nuts inside the cab holding the booster to the firewall, disconnected the booster from the cable and the brake pedal. When I tried to lift out the booster it wouldn't budge. Acts like there is something else holding it to the firewall but I can't see anything. The Haynes manual doesn't show anything. What am I missing? I tried to pry it loose, put nuts back on the booster bolts and tapped it with a hammer after placing a block on the bolts. I'm open to suggestions! This looks like a straightforward job and it is whoopin my behind.