Cucv axles swap-k20, brake concern

[SunSoaked]

In the process of swapping 14ff/Dana 60 into my 85 K20. I spec'd a new m/c for the k30. I'm wondering if the combination valve located on the frame horn cross member needs attention? Anybody have any input on this? Appreciate the help.

[cadillac_al]

I put a Dana 60 on my 76 K20 and didn't do anything with the brakes. Same master and combination valve and it works fine.

[Ziegelsteinfaust]

The cucv likely used hydroboost. Which can be a better brake system since it allows more pressure to be applied.

Like stated above you do not need to switch anything more to make the set up work.

[sweetk30]

as said it can work .

but to be 100% correct the 1/2 and 3/4 ton calipers are smaller piston size over the 1ton dana 60 size . so they require more volume of fluid .

lots have gotten away with this swap and been happy . and lots have not been happy .

if you can get the hydroboost parts and brake pedal and the lines and pump from the doner truck and swap them in . you will like the hydroboost better over vac brakes .

[SunSoaked]

Thanks for the info. I'm doing major conversions on the truck over the next few months. Stage one is the axle swap, then the hydroboost, serpentine setup, edelbrock pro-flow and the nv 4500/205 swap. I have the hydroboost/hydraulic pedal assembly as well as the manual trans/tilt steering column ready to go (driveline mods tbd).
Regarding the brakes- I was just wondering if that valve would affect the bias of the brakes, assuming it's even different between a K20/30? I assume it's a combination valve (proportion/pressure loss warning) thing. Looking at it the other way-if I put the K20 valve in a stock cucv, would it have any effect?