Allis Chalmers forklift ACC-55

Hello, Leo. I recently bought an ACC 55. I reached out to my local forklift service shop and they couldn’t match up my number either. They were only finding AC 50. I’m sure there is a fair bit of cross over with earlier and later models. What are the issues you are having?
When I got mine the breaks weren’t working and the E-break also wouldn’t engage. There’s a leak in the break line somewhere so fluid was about gone. So that should be straight forward. However the e-break connects to the main drive down a few inches off the ground, not going to jack up a forklift in my gravel drive way without a solid plan.

Be careful jacking forklifts if you have not done it before, they tip very easily when only one side is jacked up, if you have to jack side by side, do it incrementally. My ACC 50 also has inop brakes, I plan on digging into them tomorrow as I JUST  tonight brought home mine. Hope this helps.

I tried an automotive floor jack (3 ton) but it wouldn't lift my ACC-55. I never considered the fact that it would tip over from lifting one side. I will be CERTAIN to avoid doing that! I have yet to find a service manual for my forklift. I was able to remove and replace my master cylinder, but before I install the new one, I want to repair or replace the wheel cylinders. It is hard see, but I think the
brakes are only on the front wheels. I haven't yet figured out how to access them. Thoughts anyone?

And yes, typically forklifts only have brakes on the drive wheels.

I found the new master cylinder on Amazon.  It is a Dorman M2796.  I found it by googling Master Cylinders and comparing mine to the pictures.  Although I was able to find the master cylinder, I was not yet successful in locating the crush washers and the flow-through bolt that holds the bake line to the master cylinder.  I am not done searching, but so far, I have been unsuccessful.  

The crush washers and fitting should be able to be purchased at Napa Auto parts, I would go check out your local Napa. Thank you for the part number, I will check it out to see if its the same as mine :)