Quote:
Originally Posted by cruising7388
I was under the impression that the ABS system addresses each wheel discretely rather than addressing all wheels collectively. If that is true, why would the ABS system care if different wheels have different diameters?
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The rear drive vans look at it as a 3 zone system with independent front sensors and one for the rear unless it has stability control, AFAIK. The system compares wheel speeds to determine in any are slipping.
The sensors read rpm, so a different diameter at the same speed rotates at a different speed and different speed on different wheels indicates loss of traction, as it would with a wheel skidding. This will trigger the ABS to pulse the brakes, and eventually disconnect itself and go to standard brakes.
The consensus that I got from the good mechanics that I talked to was that they thought the 1" diameter bigger, 3-4% wheel speed difference would be an issue. There doesn't appear to be a method available to program it out of the ABS computer.