i just put my front disc brakes on. now i have my original 67 proportioning valve on the car and would like to get add an adjustable one. I have a 73 mustang disc/drum proportion valve but would prefer to keep the 67 it is going to be a pain to put the 73 on because of how tight the area is.

Now my questions are:

does it matter were it is located?
where do most peole put theres?
How many psi do you have yours set on? (just want an idea as to how much)

 

If you had drums, you don't have an original proportioning valve. You have a distribution block.

You can put an adjustable prop valve almost anywhere you want, as long it's in the rear brake line. The common place to put it is somewhere near the distribution block, but I've seen people route the brake line through the cab and mount it inside the cab for easy access.

As far as setting it, you'll need to experiment. You want the front brakes to lock just before the rears.

 

pretty much nailed it on the head.

 

The stock location works well for stock style valves,

The adjustable type that connects to the rear brake line only, can be placed farther back on the car. They are typically placed near (below) the drivers seat on the frame, etc.

IMO, ant prop valve that has both the front and rear lines passing through it are typically placed near the m/c, in or very near the stock location. But, I don't THINK it will be an issue to move it down some for aesthetic value.

On my sons 66 we placed his SSBC prop valve very near the stock location (under the hood hinge). We did this by bending new lines.

I have no idea of the PSI, we just adjusted it until it felt right while braking.

 

thanks

 

do you have disk or drums

 

front disc/rear drums for now... its gonna be 4 wheel disc in the future.

 

I have a couple of cars that have it mounted under the dash within reach of the driver. It means bringing lines into the compartment but its not that involved. Adjusting the brakes a snap, and after a few hard stops (lock ups), you will be done. The front need to lock up just barley before the rear, have a large safe secured area and go at it. If adjusted correct, its much easier to mantain control in a sudden stop. If not, then you may find the rear passing the front, not good on a public road. I would pharse it as percentage of brake applied (80/20) and not PSI. This is why a good old road test will work the best. Oh.... the last valve I installed mounted in the stock location. It had the block (5 ports, 2 in and 3 out) and valve together and came from Summit. The only draw back is you have to stop, raise the hood, make an adjustment, and go at it again. It was an easy install though.

 

I'm converting to front disc/rear drum and may change to rear disc later so to avoid buying another prop valve I went with the new SSBC style prop/adj. valve:
http://www.summitracing.com/parts/SSB-A0730/

This is the type mentioned above, does 2 functions with one part.
Jon