Our 2011 Equinox has stalled twice while braking hard and turning at the same time, this happened once to me and once to my wife. It has run great otherwise, just wondering if anyone else has this issue and what causes it? Thanks"

 

Get your charging system (battery and alternator) checked. Your battery is probably on it's last leg. I'd also check the vacuum line going to your power brake booster just to be safe.