Post more history on your car; mileage, all wheel drive, or rear, any recent repairs, etc. For some unknown ridiculous reason I did not save the link, but I watched a recent youtube video related to ABS control of the brakes that involved a CTS with intermittent brake lock up, and no solution after several visits to repair shops and several brake related part replacements. The scenario was similar to yours except I don't recall any associated codes. It turned out to be a bad brake hose which appeared normal on the outside, but had internal corrosion on the inside of the hose that was covered by its mounting bracket.
The symptoms were very similar. Drive the car for a while and the brakes would gradually bring the vehicle to a halt. There were other GM vehicles with a similar complaint. The owner found the cause by accident. The stabilitrack warning may suggest something more involved but there are many things that can cause that warning to trip. My approach would be to find out which wheels are locking down which would require raising it off the ground, provided no headway can be made with codes that may or may not be stored for guidance.
One wheel locking up and dragging considerably could certainly be picked up by the computer. The system would take issue with the steering wheel signaling a straight line and one wheel out of the bunch turning slower than the others in the presence of increased engine load. I cut the wheels a little too sharp coming out of the gas station once dropping the inside rear wheel off of the curb and immediately stabilitrack kicked in and cut power until it was satisfied everything was okay.
You likely just have a sticking caliper on the rear brakes or you possibly have bad flexible brake lines. A guy at work reused a turkey baster that he used for something else to suck brake fluid out of his truck and when he refilled with fresh brake fluid there was enough contamination he ended up having to replace all of the rubber in the brake system because it swelled up. That included the flexible brake lines, the rubber in the calipers and the master cylinder. Apparently he is bored because he paid for the rebuild kits and rebuilt everything instead of spending a few dollars more and getting rebuild units.
I SERIOUSLY doubt it is electronic and is more likely mechanical.
And it sounds like you have talked to some dumb mechanics or scammers...
Rodney
I took car to cadillac repair shop who special in cadillac repair. He did not find any codes related to brake. He mention it could be And module or computer on module or calipers or it could me anything. His suggestion was to sell the car. I have 110k moles. I did change brake pads and after few months this problem started. Talk to my mechanic who changed the brake pad he said if brake pad was the problem it could have happened right away but it didn't happen for a few months . I am planning to have my mechanic put the car on a lift and run the car and see which she'll will Jam that's the last resort. Thanks
That's right, dump it on some unsuspecting individual and move on (sarcasm). That mechanic is one more example of why they are often suspect and mistrusted. Heat is what usually brings out the worst in intermittent brake problems. Most diy brake installs neglect to clean and relubricate the caliper slides, some mechanics fail to do this also. I realized the importance and started doing it when I noticed diagonal pad wear and other irregularities from binding calipers which instead of sticking closed, were sticking open and not applying properly. Hoses and a sticking caliper should be high on the list.
I didn't mention it above, but the GM owner who discovered the problem was with a brake hose in his vehicle, had also gone through an ABS module via the dealer along with others with no success. The troubled hose acted like a check valve and as the brake system heated up and fluid expanded along with the parts, the brakes began to apply on their own generating more heat, and making the problem worse. The ABS unit is the only thing capable of additional automatic braking control so perhaps unplugging it could have ruled it out since the brakes will work normal, but without ABS management. Since you've replaced it, that should rule it out.
Electrical problems are very, rarely that consistent, however a mechanical problem subject to heat related exacerbation would likely be, as the components will heat up in a fairly consistent pattern, especially along the same route traveled.
When the car was dragged onto the tow truck, were all of the wheels locked up?
