Ford Booster Types 1967-1979

Parrallel to firewall and longer rod to pedal

Common for 1967-1977

Notice the booster rod going to the pedal is round and the eyelet is centered with the rod

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Cantilever

Common for 1977-1978

Notice the short booster rod does not directly pass through the firewall, but instead connects to a lever system and a flat bar connects to the brake pedal. The booster sits higher up on the firewall than the other boosters

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Angled pedal rod and offset eyelet

Common for 1979

Notice the angle of the booster's rod that connects to the pedal and the eyelet offset from that rod

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Each of these three styles comes in at least two variations- dual diaphragm, single diaphragm, etc. Every now and then I run into boosters that look like the first type but for some reason have a shorter rod connecting to the pedal. This is not a complete and 100% accurate list, it is a simplification and summary of the many variations of brake booster options in the 60s and 70s for Ford trucks.