Quote Originally Posted by jerry clayton View Post
OEM combo valves have a feature where initial pressure is applied to rears before the fronts.
That valve is available in a stand alone version called a hold off valve. It plumbs into the front brake circuit and prevents any pressure from getting to the front calipers until a preset pressure is reached. I've seen 100 psi listed.

Here are some links

ECI Hot Rod Brakes and Brackets Brake Facts

Brake Metering-Hold-Off Valve

I have one on my T-bucket, but not on my 46.