Brakes - Intermittent ABS Warning Light

88BMW02

GROUP 34 Brakes
Bulletin Number 34 01 88 (1555) Page 1 of 1
Montvale, NJ January 1988 Technical Dept.
SUBJECT: ABS Warning Light

MODELS: All with ABS

Problem: The ABS warning light may come on intermittently, and normal troubleshooting procedures do not indicate any defect. This can happen when the vehicle is driven over 50 mph, or on cars that have recently had two new tires, or snow tires installed.

Hint: Check all four tires on the car to make sure they are all the same brand, style, and size. Also note if there are any new tires with substantially more tread than the other tires.

Differences in tires may cause enough variance in rolling diameters to confuse the ABS control unit, which may give a false signal to the ABS warning light. This is especially true if snow tires have been mounted on the rear wheels only.