Brake piston: 1.TYPE: 4V4852,7K4937 etc. 2.Material: 45# Steel or others 3.Chromeplate or zinc coating Brake Piston2011 Hotsale Brake Piston:1.TYPE: 4V4852, 7K4937, and other types2.Material: 45# Steel or others3.Strict design and testing4.Chromeplate or zinc coating5.Delivery on timeBUY MLF PART, GOOD CHOICE! 2011 Hotsale Brake Piston