Set speed does not cancel when the brake pedal is pressed
Diagnostic procedure
Check for diesel engine management system DTCs.
Check the No. 3 (10 A) fuse in the under-dash fuse/relay box.
Do the cruise control input test.
Test the brake pedal position switch signal input.
Do the brake pedal position switch test.
Also check for
Short to power on the BRN wire
Faulty brake pedal position switch