TwinCharged (and others), you may find some value in this recorded presentation regarding braking systems, specifically the topic of ABS strategies (preemptive, which you would see on a road car v. reactive, which is what you are likely to encounter in a race vehicle), among other facets that should be taken into consideration. Start at around the 19:45 mark for the section on ABS braking events. While modern ABS systems are far more complex than what we are familiar with in our cars, the fundamentals are similar. The Brake handbook by Fred Puhn also has a section on the function(s) of proportioning valves that you may find useful. It can be found in PDF format through various resources on the web.

 

The system is working and bias is adjusting fine. It was a bad bias valve. I had everything connected correctly to start.

Replaced the valve, bed the system, and pedal feels great. Haltech data confims the front to rear brake pressure ratio changes as I turn the ****. Once Texas thaws out, I'll be getting real data from threshold braking.

I spent 30 minutes on the phone with Chase Bays and went over all possible scenarios. All we could come up with is a bad bias valve. They sent me a new one and we're good now.

Once I get data, I'll update again.

Thanks all.

 

Braided lines between the master cylinders and ABS module is perfectly acceptable, does not affect pedal feel, and is used on almost every modern GT4 and GT3, race car.

 

I data logged with Haltech the front and rear brake pressure. Data looks great and I pedal feel is amazing. As a test, I can also lock up the rears before the front of I'm running 50/50 bias.