I would try fixing that one. Looking on Napa's website, they have a rebuilt master cylinder for 41.99 but it has a plastic cap.

https://www.napaonline.com/en/p/NMBP21698


Mike
1955 Chevy 6400 ex-flatbed (no bed now!) sold September 2023
In the Stovebolt Gallery
1958 Chevy 6400 flatbed W/dump
In the Stovebolt Gallery
1959 Chevy Suburban Owned for almost 20 years, Daily Driver -- sold May 2016
In the Stovebolt Gallery

Sufficient unto the day is the evil thereof