Question about brake cylinders.

[RParker]

I was hoping to just change the shoes and be done, but that would have been to easy. The cylinders are pitted and in need of serious attention. The cylinder that I pulled is larger (1 3/8" dia.)than the spares that I've had for years.
My question is this, what do I have? A Canadian replacement, something from a civilian truck an upgrade not listed in the manual?

 

[USMC 00-08]

I can't give you an answer but maybe I can help narrow down what you are trying to figure out. I just rebuilt the front axle wheel cylinders on my M135. The truck was rebuilt at the Tooele arsenal in 1959. All four wheel cylinders had a bore diameter of 1 1/2". Haven't gotten around to the back ones yet.

Some guys on here have said they have wheel cylinders with a 1 1/4" bore diameter and some others with the 1 3/8". I believe it is the Canadians who used the 1 3/8". Sorry I can't give you a definite answer.

 

[SturmTyger380]

Just make sure to not mix the piston rods that go from the piston to the brake shoes. They are not all the same from piston size to piston size.