Are the proportioning valve for drum breaks the same for disk breaks. I am putting disk breaks on my 67 F250 and need to know if I have to change the proportioning valve too. Thank you

 

They are different. You will want the proportioning valve from the donor vehicle.

 

Did the drum brake trucks even have proportioning valves? Or were they simple distribution blocks with the shuttle switch for the dash light?

I hate doing things twice (brake line plumbing) but I usually take a wait-and-see attitude towards this. Depends on how the truck is otherwise modified (if at all) and which brakes are being used.
My Bronco still uses the original master cylinder (minus the residual pressure check-valve for the front discs) and original distribution block ("H-block") on the frame. Best balanced brakes of all of my Fords as it turns out.
Ford 1/2t front brakes and one size larger wheel cylinders at the back with otherwise stock brakes.

That said, a prop/combo valve is appropriate when changing to discs, especially with a pickup that stays empty most of the time. So if you want to just do it once and never mess with the lines again, a prop valve can be a good thing.
Since most of the cheap Chinese valves available from the usual sources are prone to leaking around the rubber boot hiding the delay-valve, I'm pretty much done with them and only use a manually adjustable prop valve in the rear lines only. Fronts stay unmolested.
Wilwood has the manually adjustable ones normally, but also just came out with one that looks a lot like the other brands that leak. Hopefully theirs is of better quality and not just a re-badged cheapy.

Every truck is different. Hope yours works out.

 

Thanks guys, I figured out that the guy who had the truck before had already put disk break proportioning values on it, so I don’t have to change those out, I did get them from the truck I got the disks breaks from just in case though. Thanks guys helped a lot.

 

Brake Pressure Differential Valves (aka proportioning valves) were introduced in 1967 along with dual master cylinders. The type used in 1967 are 1967 only.

You need to know what the donor is, because there are different types for 1968/79. Some are 2WD only, some are the same 2WD & 4WD .. F100 might be the same as F250/350, might not be.

 

Building on 1967F250prerunner's question, can a drum/drum proportioning valve be used for a disc/disc application? I believe a drum/drum proportioning valve proportions the pressure pretty well 50/50 front and back, right? A disc/disc application would also require this similar 50/50 proportioning.
The master cylinder controls residual pressure so I realize that is another story

 

The valves used in 1967 are 1967 only and no 1967 truck had disc brakes.

See post #5.

 

I didn't realize the one year only application of 1967 proportioning valves. perhaps I should have posted this over on the 73-79 truck section. regardless, what I had in mind was taking a factory drum/drum truck and swapping disc brakes front and back, and reusing the drum/drum proportioning valve.

 

I believe all 67's, which I have as well, with drum/drum have pressure differential valves, as suggested by 1Ton basecamp earlier in this thread, which really just activates a brake warning light in the event that one of the circuits loses pressure. This is different than a proportioning valve used with disc brakes.

This link may be helpful, it certainly was to me. Proportioning Valves 101 - FORDification.com

 

There were no disc brakes in 1967 for any Ford truck. No Ford truck had a proportioning valve with or without disc brakes.

Dual piston caliper disc brakes were optional for 1968/72 F250 2WD & F350.

F100 2WD's didn't have discs until 1973, F100/250 4WD's didn't have discs until 1976

Pic: 2B257 Brake Pressure Differential Valves for 1967/72 Trucks & Econolines: