WARNING: This page is about a different car, the 2003 GMC Sonoma, 2003 GMC Jimmy, 2003 Chevrolet S10 Pickup, and 2003 Chevrolet Blazer. However, it is still accessible from the selected car via links, so may be relevant.
Remove the nut and the bolt that retain the brace to the impact bar.
Remove the nut and the bolt that retain the brace to the frame.
Remove the brace from the vehicle.
Fig 1: Removing Nut & Bolt Retaining Brace To Frame