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Message: <blockquote data-quote="AuroraGirl" data-source="post: 28678" data-attributes="member: 9417">1988 when they introduced the EBC4 4WAL abs on the C/K trucks (i think the suburban/blazer may have had some on the R/V line somewhere 1988-1991), would have only used a calibration for tire size for wheel speed sensor calibration so it knows the proper speed of the tires only.The EBC310 in the 199(4?) to end of Gmt400 would have used the info the same way.The EBC325 and EBC325v in the Gmt800 trucks use the calibration a little bit more. 1) since there is DRP(Dynamic rear proportioning) It uses this info to help know modulating the rear brake pressure what the road contact patch, tire diameter, etc look like so it can assign the right value since this is going to use static math for crude curves/scenarios, its not the biggest change in the world but its still gonna be considered. The biggest thing is for calibrating the speed of the wheel as it rotates, since there were many tire size options it wants to know what one so it uses th right tables.</blockquote>