What are the basic characteristics of the H-body braking system?
The front brakes are 9.5″x1″ disc brakes with single piston floating calipers. The discs for 1971-1975 cars are not vented–vented rotors were added in 1976. The rear brakes up to and including 1975 are 9″x1 1/4″ drums. In 1976 the Monza/Sunbird/Starfire/Skyhawk got 9 1/2″x2″ drums. Both power- and non-power assisted brakes were available. Pre-1976 cars do not have combination/proportioning valves.