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I need some help in regards to a MC on a M39 series truck. M62 Wrecker to be exact. We are in process of getting this up and running and stopping for use around the compound. I am working on getting it stopping. I have looked through the TMs we have in our library and the manuals posted here on SS, but they all seem to have the same thing. NO info on the master cylinder.
I pulled the MC from the truck and tore it down. I did notice that the spacer was missing at the rod end of the piston and when pulled apart, found no check valve and seal at the outlet of the bore.
We have a train car....a literal train car, two of them.....full of parts. There was another FE1575 master cylinder in one of them. It had the spacer, so, I pulled it apart to possibly use the casting since there are a couple of pitted areas in the original cylinder and the spacer. When this was disassembled, there WAS a check valve and seal at the outlet.
I went on line and started researching. I found conflicting info. Some places had kits that had NO valve and seal, some places had kits that HAVE the valve and seal.
My gut tells me that it should have one, but I figured i'd ask.
This MC is used on the A1-2 M39 trucks too, and I think on the 800 series, but they are diesel, this is R6602 powered, however, the braking systems are the same as in air assisted so it has an air pack and not a hydrovac like on an M8 so I don't think the check valve is in the air pack.
Does anyone have experience on these master cylinders and/or a diagram of the assembly?
First picture is of what came out of the cylinder that was in use on the truck, but was non op, second is the donor out of the parts train. The donor had a green tag, from the Army, stating that it was serviceable but in need of rebuild, which it is, it is very clean inside!
![Original.jpg Original.jpg](https://www.steelsoldiers.com/data/attachments/662/662405-a5d2379043f8ffae648f469b974c3922.jpg)
![Core.jpg Core.jpg](https://www.steelsoldiers.com/data/attachments/662/662406-307c4ca0913b7c2bd25371c425d28250.jpg)
I pulled the MC from the truck and tore it down. I did notice that the spacer was missing at the rod end of the piston and when pulled apart, found no check valve and seal at the outlet of the bore.
We have a train car....a literal train car, two of them.....full of parts. There was another FE1575 master cylinder in one of them. It had the spacer, so, I pulled it apart to possibly use the casting since there are a couple of pitted areas in the original cylinder and the spacer. When this was disassembled, there WAS a check valve and seal at the outlet.
I went on line and started researching. I found conflicting info. Some places had kits that had NO valve and seal, some places had kits that HAVE the valve and seal.
My gut tells me that it should have one, but I figured i'd ask.
This MC is used on the A1-2 M39 trucks too, and I think on the 800 series, but they are diesel, this is R6602 powered, however, the braking systems are the same as in air assisted so it has an air pack and not a hydrovac like on an M8 so I don't think the check valve is in the air pack.
Does anyone have experience on these master cylinders and/or a diagram of the assembly?
First picture is of what came out of the cylinder that was in use on the truck, but was non op, second is the donor out of the parts train. The donor had a green tag, from the Army, stating that it was serviceable but in need of rebuild, which it is, it is very clean inside!
![Original.jpg Original.jpg](https://www.steelsoldiers.com/data/attachments/662/662405-a5d2379043f8ffae648f469b974c3922.jpg)
![Core.jpg Core.jpg](https://www.steelsoldiers.com/data/attachments/662/662406-307c4ca0913b7c2bd25371c425d28250.jpg)
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