As master cylinders get older the push rods can start to get worn out due to the excessive use. The rod has a thread of 5/16 UNF which fill fit onto any obp bias bar.
Master Cylinder Replacement Push Rod 80mm Long M8x1.25mm Thread
CLASSIC MINI BRAKE MASTER CYLINDER REPLACEMENT CAP FOR GMC227 / GMC90376
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OBP Race/Rally Brake/Clutch Master Cylinder 1 Inch Bore