1979 Honda CB750F Master Cylinders & Rebuild Parts

The supplier specifically calls for the diaphragm plate from the old master cylinder to be reused with 29-0050. Check that the plate is present and suitable before buying the reservoir package; this retained-part requirement matters when rebuilding an incomplete cylinder.

Round thread-on cap 29-0080 lists the rear master cylinder for the 1979–82 CB750F. Its front-CB750F application is the earlier 1975–78 range. It supplies a cap replacing 43513-MJ6-006 and a diaphragm replacing 45520-300-000; use the position-specific listing when comparing it with your reservoir.

The reservoir kit already lists a diaphragm along with the plastic reservoir, cap, O-ring and screws. The separately sold 08-0285 diaphragm offers a smaller repair option when the other reservoir parts are retained; do not automatically add it merely because a reservoir kit is being ordered.