Brake Master Cylinder: Application and ID

Master cylinders have identifying information stamped into the unit. Delphi master cylinders have identification information on the front surface of the body. The first and second digits are the build code. The third digit shows the year it was built (5 means 1995, 6 means 1996, etc.). The last digits show the day it was built (Example: 271 means it was the 271st day of the production year).