67 Drum to Pwr Disk porportion valve question

DFriedl · Feb 17, 2020

I have mostly finished conversion of my 67 FB from the old manual drum to power disk brakes. This all went well however I dont really want to use the oversized separate portioning valve supplied. Call me anal however is just big ugly and going to be a real pain to install. The exiting distribution block is only that as the original brakes were standard drum with no assist.

My question is for a recommendation for a good quality all in one positioning valve. I have l looked at NPD, CJ Pony and some otherventors. The pricing and reviews for any of thsed are all over the pace. All I think I need is a nice brass unit.
The engine is a stock 289 auto 2bbl and will not be used for racing.

Thanks in advance for any comments

2Blue2 · Feb 17, 2020

Welcome aboard.
I lean towards these
Post pics of your car please.

AlmostCoffee · Feb 19, 2020

Sorry to hijack the thread but I have a quick question regarding disc swaps as well that doesn't really warrant its own thread. I currently have the Wilwood prop valve and am planning to run drums in the rear (discs in the front) until I pick up a new rear end when i'll go to discs. Can i just run the prop valve adjusted for the drums for now then readjust the flow rate for the discs when i perform the swap? I don't see why this wouldn't work, however on other threads guys were basically saying you have to have a special master cylinder for disc/drum which doesn't make a whole lot of sense to me, since the prop valve will limit flow rate to the rears for now... Just looking for the thumbs up before I proceed.

2Blue2 · Feb 19, 2020

Comes down to MC bore, bais, and volume of fluid pushed.
There is often a different size Master cylinder bore for the kind of calipers (read volume needed) you use.
Having the wrong MC bore can make a power system have a harder pedal than a manual system.
What kind of car / weight is involved. Is it power now? Will it be in future? MC higher than brakes?

ie. the 67 mustang disc/drum master won't push enough fluid to rears to work the old Lincoln Versailles 9-inch rear-disc swap.
Bottom line you need a MC to match your system component choices.

AlmostCoffee · Feb 19, 2020

2Blue2 said:
Comes down to MC bore, bais, and volume of fluid pushed.
There is often a different size Master cylinder bore for the kind of calipers (read volume needed) you use.
Having the wrong MC bore can make a power system have a harder pedal than a manual system.
What kind of car / weight is involved. Is it power now? Will it be in future? MC higher than brakes?

ie. the 67 mustang disc/drum master won't push enough fluid to rears to work the old Lincoln Versailles 9-inch rear-disc swap.
Bottom line you need a MC to match your system component choices.

It is a 1" wilwood master cyl attached to a 7" booster. I based the master cyl bore off of other disc kits and disc/drum kits having 1" bores. Front discs are 4 piston dynalites, rears will probably be either explorer discs if I go ahead and narrow an 8.8 or whatever comes with QP Performace 9" rears if i do that.

2Blue2 · Feb 19, 2020

AlmostCoffee said:
It is a 1" wilwood master cyl attached to a 7" booster.

I would suggest getting Wilwoods blessing on your plan and choice of components

67 Drum to Pwr Disk porportion valve question

DFriedl

New Member

2Blue2

will be trying this sex one when I can find it

AlmostCoffee

Active Member

2Blue2

will be trying this sex one when I can find it

AlmostCoffee

Active Member

2Blue2

will be trying this sex one when I can find it

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67 Drum to Pwr Disk porportion valve question

DFriedl

New Member

2Blue2

will be trying this sex one when I can find it

AlmostCoffee

Active Member

2Blue2

will be trying this sex one when I can find it

AlmostCoffee

Active Member

2Blue2

will be trying this sex one when I can find it

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