Braking problem - malfunctioning ABS

ChrisSlicks

Some things I can think of that may be happening to you bullitt.

1. Your BBK comes with very grippy track pads. The ABS system doesn't seem to like these kind of pads because they are difficult to modulate, and the cycle time of the controller isn't allowing them to release which causes it to go into an ice mode where it releases the pressure for longer intervals.

2. The ABS system was designed with dynamic brake force distribution. Unlike a traditional brake system which is balanced with a front bias, the dynamic system can send a full 50% of the brake pressure to the rear. It then uses the ABS actuators to modulate the percentage of brake force to the rear depending on the input from the wheel speed sensors. So apparently when the ABS system is disabled it is locking in to a 50/50 split which is going to be pretty useless for manual braking.

3. This one I haven't been able to confirm, but the ABS system may be very sensitive to wheel diameter changes, and is unable to auto-calibrate. The people that are experiencing the biggest problems with the ice-mode effect seem to be running after market wheels and tires. When I asked my dealer mechanic (the GTR master mechanic) if the wheel diameter could be programmed, he said no. Now I'm not sure if that is no, there is no way to do it, or no, he has no clue how to do it.

Has anyone with stock tires experienced ice-mode? Please speak up!

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