My 300F has a Raybestos Element 3 Dual Master Cylinder installed by the previous owner. It is a tight fit and it is difficult removing the one piece reservoir cover to check the fluid level because of the close proximity to the power brake booster, but it can be done. The bolt pattern is a perfect bolt on replacement for the stock cylinder.

On Sunday, August 3, 2025 at 1:16:17 PM UTC-4 John Gaynor wrote:
Howdy
Has anyone installed a dual master cylinder without doing a disc brake conversion?
I enjoy the originality of the drum brakes, however having the safety of a dual master would be comforting.
Appreciate your thoughts.
John