5 Short Pin Long Pin CALIPER INFORMATION AIR DISC BRAKE CALIPER IDENTIFICATION Axial vs Radial Axial – a mounting surface that is parallel to the rotor Radial – a mounting surface that is perpendicular (90º) to the rotor Some calipers have a radially mounted air chamber. If your caliper has a radial chamber (sits on top of the caliper) and is not on a transit bus, please refer to PB-1461. Calipers identified as Left or Right based on the location of their short or floating pin. In most cases, a left caliper will be used on the driver’s side of the vehicle. There are some exceptions where interference in the wheel well prevents this. Make sure you replace a left with a left and a right with a right. Short Pin Short Pin Long Pin Left Caliper - Driver Side - Type B Right Caliper - Passenger Side - Type A Axial Mount Radial Mount
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