There are three sizes of Series brakes: 88s had 10" diameter drums (until 1980, when rationalisation gave them 109 dual circuit brakes); 109s had 11" drums (with later models having twin leading shoe front brakes, servo assistance and dual hydraulic circuits), and; Stage I V8s and 2.6l 6-cylinder models, which had 11" diameter but 3" wide shoes and square shouldered rather than bevelled drums.
