Why Grooved Brake Discs? When Brakes get very hot they produce a gas whcih can build up between the surface of the brake disc and the brake pad. This layer of gas stops the pad from contacting with the brake disc so you get what is known as 'fade'.   The grooves help to dissapate the gas by allowing it to escape through the grooves and the grooves also help to keep the pad surface clean and deglazed.

Grooved discs are usually directional and must be fitted to the correct side of the vehicle.  To ensure maximum performance and service life and to avoid damage, new brake pads, shoes and discs require "bedding in". Avoid violent braking from high speed or excessive lighter braking applications for at least 200 miles. Before fitting discs it is vital to ensure that the vehicle hub is free of debris/dirt and rust deposits, otherwise brake judder may occur. Disc and drum braking surfaces should be cleaned using a suitable brake cleaner before fitting.