Originally Posted by Aferalhamster
why would a wheel speed sensor cause the brake to lock up? would that cause the 4 wheel drive system warning too?
The computer uses the wheel speed sensors as part of the ABS and traction control system.
A faulty wheel speed sensor could send information that tricks the computer into thinking that the wheel is spinning at a different rate than the rest, causing the brakes to be applied in an attempt to get the sensor reading to equal the other three.
As to the 4WD warning I'm not so sure. I suppose it could, but I do not know which systems feed in information to set that light.