ABS was available as an option on the 4-wheel disc brake models. There are many standards for mounting disc brake calipers. The front disc brake grooves are curved. This option was created due to a shortage of rear disc brake components. The earlier fairing of the disc brake was removed. Frame manufacturers have standardized the IS mount for the rear disc brake mount. Power brakes with front disc brake calipers were standard on all 1973 Chevelles. The 1000 received a rear disc brake. Power brakes with front disc brake calipers were now standard on all '73 Cutlasses. Braking is achieved by a disc brake mounted on the rear axle. These three models came with a front disc brake made by Campagnolo. The company also offered disc brake conversions for the Ford Anglia. A rear disc brake replaced the earlier drum. The following description uses the terminology for / and configuration of a simple disc brake. Disc brake mounting interfaces that are splined include Centerlock, by Shimano.