2010 GMC Acadia Owner's Manual - Page 260

9-4 Driving and Operating If the engine ever stops while the vehicle is being driven, brake normally but do not pump the brakes. If the brakes are pumped, the pedal could get harder to push down. If the engine stops, there will still be some power brake assist but it will be used when the brake is applied. Once the power assist is used up, it can take longer to stop and the brake pedal will be harder to push. Adding non‐dealer/non‐retailer accessories can affect vehicle performance. See Accessories and Modifications on page 10‑3. Steering Power Steering If power steering assist is lost because the engine stops or the power steering system is not functioning, the vehicle can be steered but it will take more effort. Steering Tips It is important to take curves at a reasonable speed. Traction in a curve depends on the condition of the tires and the road surface, the angle at which the curve is banked, and vehicle speed. While in a curve, speed is the one factor that can be controlled. If there is a need to reduce speed, do it before entering the curve, while the front wheels are straight. Try to adjust the speed so you can drive through the curve. Maintain a reasonable, steady speed. Wait to accelerate until out of the curve, and then accelerate gently into the straightaway. Variable Effort Steering The vehicle has a steering system that continuously adjusts the effort felt when steering at all vehicle speeds. It provides ease when parking, yet a firm, solid feel at highway speeds.