@3B, it is a dual piston master cylinder with a, 1 3/4" cylinder bore. I can only find it on the 7500 series trucks. I've noticed it has some pretty heavy parts for a 2 ton.
@JRMunn, it definitely is a challenge. I have found out that many of the part numbers that cross to the cylinder are discontinued. I haven't been able to find a new one but I did just this second locate a re-manufactured one through NAPA. I used the Raybestos link that someone posted as a reply.
As far as the boosters are concerned, there are 2 boosters mounted to the frame under the cab. I know the master cylinder is weak so I will find out shortly if it doesn't fix the problem!
So does anyone know if you can post photos to this forum? I'd love to share the progress.
