Hello all,

For several years now, my racecar has had its slip and vdc lights on since it was gutted and built into what it is today. It never affected performance on the track and I never thought much of it. I know I have a code currently for a steering angle sensor since I have a Sparco wheel and Works Bell hub. Again, never had an issue with VDC still being on or ABS. I now have a brake light on, and am having weird ABS issues. The car has ST40s up front, with OEM rear brembos.

Here is a description of the issues from this past weekend at Sebring. I was having inconsistent feedback from the brakes. Sometimes its a hard pedal that feels like pad fade (buts it not). Other times, its a bit soft and feels like knockback (possible). Lastly, sometimes I can get the whole thing to lockup. I haven't scanned the car since this past weekend to determine if its the pump or a speed sensor. My question is about the steering angle sensor. I can live with the slip/vdc lights on. Am I wrong in assuming that this is not the issue with my abs? Is it is separate from the ABS? I am going to crawl under this week and check the speed sensors. I have been racing this car for 6 years now, and never even removed/cleaned a sensor. Any thoughts/experience would be great.

Thanks,

Joseph

 

I had similar issues a few weeks back and went over and over on the possibilities. Checked my brake fluid and it was right in the middle of the min\max lines. I filled it over the Max line and never had an issue again. I'm thinking the sensor in the reservoir was reading low fluid in higher G turns.

Sometimes its the easy answer. Just a suggestion.

 

Mine has done this from time to time at different tracks. Mostly after i went to a square tire setup. What are you running for tires?

 

275/35/18 BFG R1 all around

 

If you've raced a Z33 for any significant time, you've probably experienced some sort of brake problem at one time or another. But they are almost always due to factors other than the steering angle sensor or slip/VDC lights. If you've disconnected the yaw sensor, you're always going to have the CEL for these items.

Aside from the odd component failure (ie. speed sensors, harness, ABS pump, etc), the braking system itself seems pretty stout. That doesn't mean that a build up of heat, or the odd wheel vibration won't throw off the system. If that happens, and if the dreaded ABS light comes on, watch out!

 

This. I had this issue after installing my clutch/flywheel and swapping fluids. Guess I didn't fill it up past max and all my lights were on. I flipped out and retraced all my steps. Came on here and someone suggested adding more brake fluid...it worked for me