Brake Disc - Bonded fits John Deere 4400 4420 7445 AH19839 fits International M MD Super M Super MTA Super W6 400 450 121961C92 fits Case IH 1963810C2

Bonded brake disc used in the wet disc brake systems on International's postwar row-crop and utility lines — the M-series and 400/450 era tractors — and carried forward into later International and Case IH combines. At 6.500" outside diameter, 3.500" inside diameter, .500" thick, with a 12-spline 2-1/4" bore, the dimensions are specific enough that substituting a close-but-not-exact disc is a common mistake. Thickness is the other number to watch — a disc worn thin will drag and generate heat even when the pedal is released. Bonded construction holds up better to oil contamination than earlier riveted designs. Sold individually, so order to match the number the system requires.