Brake Proportion Value in first gen
 

I sure this must have been covered but I can't find it in racing or first gen sites.

On a disk brake car, GSL or SE is there any value to retaining the stock proportion value if you are installing a line pressure adjustable value in that rear line like a tilton?

I have seen most racers that are still using the stock master cylinder also retain the stock proportion value and then install that cockpit adjustable value after it. That would mean you have one (stock) pressure reducing knee then followed by a second one. That second one can only further reduce rear line pressure.

Since the stock master cylinder has outputs for what appear to be two front brake lines and one rear brake line can't the factory prop value be removed and the aftermarket prop value be installed on the line going to the rear?

Any value to retaining the stock prop valve IF we using that adjustable valve in line to the rear?

Any value in gutting the stock prop valve when using the 2nd prop valve?

Thanks

Take out the stock one and use a "Y" block for the front.

Gutting the stock one is a waste of time. And doesn't work the way you thinking. It's more for if you lose one of the brake lines. You don't lose all your brakes.

Gian

The stock master cylinder has three output lines. One goes to the front driver's side caliper. I planned on retaining that.

The one right next to it goes through the stock prop valve and to the other front brake. On that line I was thinking I could just by pass the stock prop value and go direct from that fitting on the master cylinder to the passenger side front caliper. Then of course the third output on the master would go to the rear (with the Tilton). Gian why would I need a "Y" block?

Of course the third output on the master cylinder that goes the prop and to the rear would by pass the prop valve.

Thanks

If your master has 2 front ports, it's all good. You don't need the Y. You got the right Idea.