I have 2006 Pontiac Torrent AWD with front disc and rear drum brakes. I need help with my ABS & traction control lights come on together (sometime) when I hit brakes slowly to slow down my car around 20-30km/h with a grumbling/scraping feeling sent to my feet from brake pedal (feel like rumble strip on highway). ABS & T/C lights go away if I shut off engine and restart car. It also happens if I accelerate at that speed. This issue does not happen when I hit brake hard. Has anyone experienced this issue?

Sounds like your pads are gone and your metal to metal.  Probably need to replace rotors when installin new pads.  Welcome to FP