Brake Pad / Brake Bias Valve review:
I recently upgraded my '93 968 to the 928 Bias Valve, and KFP Gold pads (with fresh teflon/braided lines), Motul 600. I've been running the KFP's on the car for three prior events, so I had a good feel for them on the 968. I just finished three days at Pocono, and here is my impression:
Brake Balance - Definately feels better, especially below 100 in moderate to heavy braking. Above 100, the change is more noticeable in threshold braking. The car still "squirms", but doesn't have that feeling like it is going to bury it's nose into the asphalt. Tail feels planted. Threshold braking seems more balanced. I had to do a couple of mid-turn braking excercises due to cars in front "loosing it", and the car felt very well in control.
Brake Temperature - I experience no issues with brakes over heating, or reaching over temperature. Did a full day on the Pocono East course, same KFP Pads, and reached over temperature a couple of times in the day a couple of weeks ago. No such issue this time around. I had fresh ATE Blue previously (two weeks old then), and upgraded to Motul 600, which would provide some benefit as well. East course doesn't give the brakes as hard time as some course, but doesn't provide much time between laps to cool down. Maximum speeds ~100, with a mid-course 90-50mph into a hairpin. Total course length is only 1.37 miles, and has three threshold braking zone in the ~85-100 to ~60-50 region. The rest of the course has a few "settling" braking zones.
Braking distances - no improvement. Did 60-0/80-0 braking tests, using the Traqmate to record G-forces and distances. On repeated tests with consistent performance. 60-0: 140ft, 82-0: 238ft, Results were consistent with stock road tests from '93/94. Didn't do a brake test before however. What I did see was the performance didn't degrade over the three days of driving. I did just over 200 miles of track driving, between Pocono North, South, East and Double-InField. Maximum braking was nicely consistent at ~1.255G. Previously, I would see a degradation of time on braking acceleration forces.
Now the question, is should I upgrade to higher torque pads.........
So the Bias value didn't shorten distances, nor did the KFPs. They both improved feel and controllablity, and provide much needed endurance. Nothing can spoil a track day like a set of overheated brakes. (Yes there are worse thing, but this is something preventable!)
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