Cadillac Repair Questions? Ask a Mechanic for Answers ASAP
It sounds like your anti lock brake system is activating and causing that grinding noise. When the ABS activates when it shouldn't it sounds like a grumbling and a motor running type noise as the motor kicks on and off while trying to figure out if there is a loss of traction. This is probably happening because of either a bad ABS controller or a faulty speed sensor that is telling the ABS computer that the vehicle is sliding and it needs to activate the traction system. Do you have a scan tool to check to see if the computer is logging which speed sensor might be acting up?
I just wanted to check and see if you need additional help with this.