I'm familiar with the brake bolt you're referring to. I have a G35 coupe and recently did a brake job on a G sedan. If I remember correctly, that bolt is torqued to 125 ft lbs. per the FSM. I was able to get the bolt off by soaking with Liquid Wrench, turning the wheels outward, and placing a jack underneath the suspension arm. The bolt came loose with the help of a long breaker bar.