Brake Piston Assembly Fits International Harvester Tractors. Replacement brake piston assembly for International and Farmall tractors, including models 706, 756, 766, 806, 826, 856, 966, 1026, 1066, 1206, 1256, 1456, 1466, 1468, and Hydro 100, as well as select construction and industrial models. Replaces OEM Part Numbers. Engine Compatibility by Tractor Model. Hydro 70 Thru Hydro 186. Not sure will this part fit? We can search quickly and confirm or find you the correct one! You need correct replacement? Just let us know and our. Parts specialist will help right away!