D154 forged billet caliper is a direct -on, lightweight, high-strength, extreme alternative to the OE cast iron calipers that were used on a wide range of disc brake equipped mid size cars and small trucks beginning in 1978. Use of this caliper still be found on some models as late as the year 2002. The wide spread and affordable availability of D154 calipers and brake pad compounds also made it a popular choice in a number of restricted class categories and drum to disc conversions on all types of and machines. There are three piston configurations available for the D154: A large 2.50" single piston, and two two-piston models featuring 1.62/1.62" or 1.12/1.12" pistons. All three calipers utilize pistons. pistons are used to resist corrosion and retard heat transfer from the pads into the caliper body. High temperature, square faced bore are used to provide controlled piston retraction and performance from the wider sealing face. This of is a performer with long service life and a history of performance in any type of driving environment, including extreme sustained high temperature racing applications. The caliper slide pin holes are fitted with dampening rings to minimize noise from vibration. The caliper is also fitted with bleed screws on both ends to facilitate mounting in any left hand or right hand, front leading mount, or rear trailing mount locations.