1964 Valiant Single to Dual Master Swap Question

You should be able to reuse your old pushrod. The pushrod has a "retainer" ring the fits into a groove, then seats in the groove in the master cylinder to lock. You must use a new retainer on the new m/c.

When I did mine I think I yanked back on the brake pedal to unseat the old pushrod from the m/c. Then unbolted the m/c, cleaned up the firewall and made a gasket to fit. Bolted on the new m/c, ran new lines, then bled the m/c. Don't forget to bleed the new m/c to get the air out.

Can't remember which m/c I used, but I ended up buying an adjustable pushrod and new retainer from Dr. Diff. The original was a little too short.

The hardest part of the whole thing was making the new brake lines!