Description:Brake pistons, like part # 552-4958, are a critical component in the service and parking brake system used to slow, stop, or hold the machine stationary.Cat drive train brake components must endure incredible torque and high impact loads during a braking application. Cat designs and manufactures its brake components with these demands in mind. The result is a drive train brake system that lasts longer and works harder over the life of the machine.Attributes:• Cast iron piston• Outside Diameter: 493 mm (19.41 in)• Inside Diameter: 366.5 mm (14.43 in)• Width: 67.42 mm (2.65 in)Application:Brake pistons are used in Cat drive train braking systems. Consult your owner's manual or contact your local Cat Dealer for more information.