The Stovebolt Site Forums The Shop Area General Truck Talk Wheel cylinder differences

I am finally putting on new brake lines, and while I'm at it I'm putting Speed Bleeders in the wheel cylinders. I bought all the wheel cylinders as a set from LMC Truck, the two in the rear matched, looked identical to each other and the replacements, both were the same part number, same manufacturer etc. I found out last night that the bleeder screws were different sizes. Both the front and the LR wheels have a larger size thread that is the same size as the Speed Bleeders I ordered. The RR wheel, though, has a smaller thread that the new bleeders won't fit.

My question is this: Is it likely that its the wrong cylinder altogether, or is it more likely that it just has a different bleeder screw for some reason (older manufacture, different plant, different brand rebuilt somewhere along the line etc.) If its not gonna be a safety issue, I will leave that one in place and either just use the stock bleeder or get a different Speed Bleeder for it rather than tear the brakes apart and buy a new cylinder. But being brakes, and especially since its for my son to drive, I don't want to leave it if there are potential safety issues.

Any input?

Hy ErikDaViking, if the body and the bore are the same, then probably somebody goofed and put the wrong size bleeder port thread in it. I would buy a Speed Bleeder of the appropriate size after confirming all the other spec's for the wheel cylinder are the same. Or you could call the supplier and explain the situation, and see if they would exchange the one you have for one which matches the other that you have.

Thanks, thats what I was thinking too.