Brake Proportioning Valve, Good bad or ugly Options

[Charles Freeborn]

So, on to the brakes in this new car. It still has the OEM proportioning valve for the rears. As I understand when the brake pressure reaches a certain limit (500 plus psi as I recall) it stops sending fluid to the rear calipers. My first question is does it stop and hold at that psi leaving the rears engaged to that level while allowing fronts to get more input, or does it drop the rears to 0?
The other consideration is to use a manual valve such as the Tilton. If going that route how does one determine settings without chancing spins or other drama?
Thanks.

[brant]

I’d recommend an adjustable if your class rules allow
(I used to run in club racing where the stock class did not allow)
I use a lot more rear pad with mine adjusted
I change the balance nearly every weekend
You can feel the difference depending on weather and even tires sometimes

To initially set your balance
Drive slow /30mph or so in a parking lot
Have 2 friends stand on each side of the car as you drive by and lock the brakes. See which axle is locking first. Then fine tune on the track