1993 Pontiac Bonneville Owner's Manual - Page 190

Driving on Grades Parking on Hills Reduce speed and shift to a lower gear You really should notpark your vehicle, with a trailer attached, on a hill. If before you start down a longor steep downgrade. If you don't shift down, you something goes wrong, your rig could might have to use yourbrakes so much start to move. People can be injured, and both your vehicle andthe trailer can that they would get hot and no longer work well. be damaged. On a long uphill grade, shift down to But if you ever have to park your rig on D (Drive) and reduce your to around a hill, here's how to do it: speed 45 mph (70 km/h) to reduce the possibility Apply your regular brakes, but don't 1. of engine and transaxle overheating. shift into P (Park) yet. If you are towing a trailer that weighs 2. Have someone placechocks under more than 1,000 pounds (454 kg), and the trailer wheels. you have an automatic transaxle with Overdrive, it's best to drive inD instead 3. When the wheel chocks are in place, release the regular brakes until the of Overdrive (or, as you need to, a lower chocks absorb the load. gear). This will minimize heat build-up and extend the life your transaxle. of 4. Reapply the regular brakes. Then apply your parking brake, and then shift to P (Park). 5. Release the regular brakes. When You Are Ready to Leave After Parking on a Hill 1, Apply your regularbrakes and hold the pedal down while you: Start your engine; Shift into a gear; and Release the parking brake. 2. Let up on the brake pedal. 3. Drive slowly until thetrailer is clear of the chocks. 4. Stop and have someone pick up and store the chocks.