pics of disc brake porportioning valve location

[tybob81]

I need some pics of 73-79 f100 disc bake porportioning valve locations. I have the set-up off a 77 f100 and my porportioning is ontop of the ps box. What about the 78 or 79 were it is mounted on the frame?

[fordman]

the 78/79 is bolted to a bracket that bolts to the rear side of the engine crossmember. heres a pic of a 78/79 valve and bracket. it s kind of greasy though.

[tybob81]

My bad my donor truck was a 76. Is there any differences? Is it better for the porpotioming vavle to be up top of the ps box or down low. The only reason Im messing with this is I decided to go rear disc bakes now to and Im swaping out my fabbed up lines and disc/drum valve for classic tube 76-77 brake line kit and a disc/disc valve

[fordman]

i think the only differences would be line length and accessability to the vavle, thats all i could think of. i don't think it has anything to do with gravity or pressure of the valve working right or wrong. the only thing i can think of is clearance for headers. would your lines or the valve be in a good or bad place if you had or wanted headers?

[tybob81]

either way works fine. Im running shorties on my 351w and there should be any problem putting the porportioning valve down lower.