Set Speed Does Not Cancel When The Brake Pedal Is Pressed

Set speed does not cancel when the brake pedal is pressed

Check for PGM-FI DTCs Initial Inspection and Diagnostic Overview.

Do the brake pedal position switch test Testing and Inspection.

Do the cruise control input test Cruise Control (PCM) Input Test.
Test the brake pedal position switch signal input.

Also check for

Short to power on the BRN wire

Also check for

Faulty brake pedal position switch