Power Drum Brake Questions

[dutchmanz]

Originally Posted by goodemj

Work picked up and the garage progress is suffering, I bought a new drum/drum MC for a 69' one ton and a new dual diaphragm brake booster for a 72' one ton. I had to make a longer push rod since drum/drum was no longer an option in 72' but before installing I questioned myself again.

Does anyone know why the front and rear axle ports are opposite on a one ton MC than on a 1/2 ton MC? I was initially going to make new MC-to-proportioning valve lines that would cross and correct this but then questioned why they were switched in the first place. Is there different fluid proportioning within the MC since one ton trucks were hauling heavy loads over the rear end?

I could just return the drum/drum one ton MC and get a 1/2 ton MC but then I would still wonder why they switched font/rear ports on the one ton MC.

I realize this thread is over a year old at this point but did you finish the project? I may have a future project doing the same thing.