Brake routing suggestions- Post your pics

[Bob_n_Cincy]

Hi touchstone,
I agree with your diagram above. One of my cars is plumbed that way, but no PV.
Do you think the abs algorithms are the same for front vs rear wheels?
Bob

[TouchStone]

Hi touchstone,
I agree with your diagram above. One of my cars is plumbed that way, but no PV.
Do you think the abs algorithms are the same for front vs rear wheels?
Bob

I don't really know, if its different that diagram may not be 100% effective. This statement from the manual has given me some doubts:

abs.JPG​<--Picture (click to zoom)

[Hindsight]

I don't really know, if its different that diagram may not be 100% effective. This statement from the manual has given me some doubts:

abs.JPG​<--Picture (click to zoom)

I'm trying to wrap my head around the idea of switching the output lines and ABS sensors to have just one line from the master controlling both front wheel cylinders (as Wayne has also suggested). But in reading that bit you posted from the manual that I quoted here, it seems like maybe that option may not work because of the different algorithms for front vs rear no?

[Junty]

Hey Hindsight,
Im certainly not a brake/ABS expert. So I looked at alternative systems, and I consulted experts such as Wayne. Then using the best advice and logic, I applied what I perceived to be the best option and system setup for my 818.
It is a fact that the Subaru ABS system is a 4 channel independent on all 4 corner system - so regardless of how it is setup, the brake pressure is independently regulated by the ABS system to each wheel - directly dependant upon which single one is changing rotational speed in relationship to the 3 others and the G force sensor. I have never received any conclusive advice that I am confident in relating to proportioning valves either before or after the ABS control unit? I therefore elected to setup as Wayne suggested with any valves - if I ever wanted to change back to the Subaru system, this is relatively easy (as I merely need to move the brake lines about 1 inch left to right at the control unit, and move the wires).
And in conclusion, the system works very well. I merely want more brake effect in the medium term, simply by increasing the callipers and rotors on the rear. This is m personal perspective and will prove itself or be reverted back upon testing - the ABS however will remain as is working very well...

[Chef818]

For the ABS users did you use the factory rear proportioning valve?

[bbjones121]

For the ABS users did you use the factory rear proportioning valve?

No I did not. It is not adjustable. I bought another willwood proportional valve and have both of them on my front. I don't know if it is absolutely necessary since the ABS system will try to prevent lockup on its own.

[phil1734]

No I did not. It is not adjustable. I bought another willwood proportional valve and have both of them on my front. I don't know if it is absolutely necessary since the ABS system will try to prevent lockup on its own.

You would still need one to maximize performance.

Unless you are running a high-end aftermarket system, I believe the Subaru ABS system from the donors is a simple on/off circuit. It'll prevent lock-up, but won't do anything to adjust line pressure front to rear. You could easily have the fronts locking/unlocking with abs and only a fraction of the pressure in the rear line needed to extract any use from the rear brakes.