815 ILCS 720/4

No brewer or beer wholesaler may cancel, fail to renew or otherwise terminate an agreement unless the party intending that action has good cause for the cancellation, failure to renew or termination, has made good faith efforts to resolve disagreements, and, in any case in which prior notification is required under Section 3, the party intending to act has furnished the prior notification and the affected party has not eliminated the reasons specified in the notification for cancellation, failure to renew, or termination, within 90 days after the sending of the notification.