How do I fix this problem on my 2003 Buick Park Avenue cruise control not working

Hello, sounds like something the system is seeking is not present - even though the brake light switch seems to be sending the impulse to "cancel" operation, there could be a servo issue or switch under the hood of concern, as well as wiring and connectors. Hands on testing referring to a workshop manual and using test equipment is needed. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops