Rear Brake Lockup Help, Help Options

[spaceshuttle]

I am running larger 4 piston Outlaw (read Willwood) calipers on the front of my v6 track car, with 911 M calipers on the rear. I installed a brake bias adjuster knob initially but my rears lockup under heavy braking no matter the adjustment. Switched to a Tilton bias adjustment with the notched rod with multiple positions and still no change. I cannot tell that there is much difference in the pressure to the rears. They will lockup no matter the position under heavy braking. They are not sticking. Not sure which direction to go from here. I am running Hawk blues front and rear. Perhaps a less aggressive rear pad? And yes the factory proportioning valve was removed.
thanks for any help guys.
LC

[Randal]

I am running larger 4 piston Outlaw (read Willwood) calipers on the front of my v6 track car, with 911 M calipers on the rear. I installed a brake bias adjuster knob initially but my rears lockup under heavy braking no matter the adjustment. Switched to a Tilton bias adjustment with the notched rod with multiple positions and still no change. I cannot tell that there is much difference in the pressure to the rears. They will lockup no matter the position under heavy braking. They are not sticking. Not sure which direction to go from here. I am running Hawk blues front and rear. Perhaps a less aggressive rear pad? And yes the factory proportioning valve was removed.
thanks for any help guys.
LC

Quick test: Go buy the cheapest pads you can for the rear from your local parts house. Put them on and see if there is any difference. I went from Hawk to elcheapo and solved my lockup issue.

[spaceshuttle]

I am running larger 4 piston Outlaw (read Willwood) calipers on the front of my v6 track car, with 911 M calipers on the rear. I installed a brake bias adjuster knob initially but my rears lockup under heavy braking no matter the adjustment. Switched to a Tilton bias adjustment with the notched rod with multiple positions and still no change. I cannot tell that there is much difference in the pressure to the rears. They will lockup no matter the position under heavy braking. They are not sticking. Not sure which direction to go from here. I am running Hawk blues front and rear. Perhaps a less aggressive rear pad? And yes the factory proportioning valve was removed.
thanks for any help guys.
LC

Quick test: Go buy the cheapest pads you can for the rear from your local parts house. Put them on and see if there is any difference. I went from Hawk to elcheapo and solved my lockup issue.

Thanks Randall. That certainly sounds like the "cheapest' place to start.
I'll let you know if it works.

[Randal]

I am running larger 4 piston Outlaw (read Willwood) calipers on the front of my v6 track car, with 911 M calipers on the rear. I installed a brake bias adjuster knob initially but my rears lockup under heavy braking no matter the adjustment. Switched to a Tilton bias adjustment with the notched rod with multiple positions and still no change. I cannot tell that there is much difference in the pressure to the rears. They will lockup no matter the position under heavy braking. They are not sticking. Not sure which direction to go from here. I am running Hawk blues front and rear. Perhaps a less aggressive rear pad? And yes the factory proportioning valve was removed.
thanks for any help guys.
LC

Quick test: Go buy the cheapest pads you can for the rear from your local parts house. Put them on and see if there is any difference. I went from Hawk to elcheapo and solved my lockup issue.

Thanks Randall. That certainly sounds like the "cheapest' place to start.
I'll let you know if it works.

I'm running 911 calipers on the front, stock calipers on the rear. If the elcheapo pads don't work, throw a stock set of calipers back on and see if you still have the problem. If it fixes the issue then you know 911 calipers on the rear are a bit much. Also took off the adjustable bias brake module as it never seemed to work as advertised and just went to a T fitting.