Master Cyl: 84 - 92 Disc/Disc (New) Except GIRLOCK Masters.READ DESCRIPTION ON LHS LOWER PAGE IN FULL. 84 88 Camaro 84 92 Firebird exc Girlock Rear Caliper fitted versions NOTE this model has BALL FLARES on each inlet pipe.. makes it distinctively different to 82 83 models. This is a brand new USA Made master cylinder for cars equipped with Disc front & Disc Rear brakes in the 84 92 series.. EXCEPT the 89 92 Hi Performance Rear Girlock Disc brake cars. THIS IS FOR 4 WHEEL DISC EXCEPT the 89 92 Hi Performance