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Rite you are! checked on parts prices and they are high! good thing these look like they have never been used. just need cleaned and lubed.

I guess at this point I dont see it as wasting my time using the wedge type brake. I understand the simple operation and maintenece of S cam type but I already have these. and they dont have cans that hang down in harms way. I also know they are expensive when it comes to replacing parts but...

I guess In the morning I need to flip one of these wheels around to test fit. thanks for the heads up.

the front is just a backing plate swap. for the rear Im thinking of just unbolting the suspension from the frame and rolling in the 939 setup. the dog bones and every thing look to be in good shape so this may be the easy way. besides Im not sure the rear backing plate and drums off the 939...

found the parts to load pictures. easy to see the differences in the 2 drum types. I dont know how many types of drum/shoes were used but heres two! dont laugh to loud at me about my axle stand. it beats sitting my butt on the ground.

Thanks

Yes---on this pile of parts.

the line I was talking about is on the back side of the service brake diaphram. these play no role in the maxi/parking brake. turns out they are plumbed this way for a remote vent according to another member who owns a M939 truck. this makes sense to me. so one more question put to rest. Now...

another question I have is why is there air to both sides of the diaphram on the service brake canister? Is the back side fitting just a remote vent or some type of positive pull off? I will put up a few pictures later tonight.

It may be worth the trip if I cant figure out how to plumb this mess. does yours have ABS by chance?

I have a wedge brake axle set up from a 939 series rear drive. also have a front drive axle set up off same series. the rear set up has central inflation. the front does not. the drums are different betwen the two set ups. any clue if the front backing plates will bolt up to an old style...