I had the same problem about 6 months ago. I somehow kept getting air in the system....couldnt find any leaks or reduction of the fluid level in the reservoir. Replaced the slave and the master cylinder, bled the system over and over...still no affect...adjusted the push rod out...still the...
Yeah, mine does that too...it has for years. It just doesn't bother me enough to do something about it. Please let me know what you find out...I'm curious if it's an easy fix or not. I've always lean towards the side of it possibly being gummed up.
Check the little rubber button that activates the cruise disengage....it is on the backside of the brake pedal. They are notorious for dry rotting and crumbling away. Without the switch being engaged, the cruise control thinks you are pressing on the brake pedal, even when you are not.