1998 Pontiac Grand Prix Owner's Manual - Page 362

Ignition TransaxleLock Check While parked, and with the parking brake set, to turn try the ignition key to LOCK in each shift lever position. The key should turn to LOCK only when the shift lever is in PARK (P). 0 Park on a fairly steep hill, with the vehicle facing downhill. Keeping your on the regular brake, set the foot parking brake. The key should come out only in LOCK. Parking Brake and Automatic Transaxle PARK (P) Mechanism Check To check the parking brake's holding ability: With the engine running and transaxle NEUTRAL (N), in slowly remove foot pressure from the regular brake pedal. Do this until the vehicle is held the parking by brake only. 1 When you are doing this check, your vehicle could begin to move. You or others could be injured and property could be damaged. Make of sure thereis room in front your vehicle in case it begins to roll. Be ready to apply the regular brake at once shouldthe vehicle begin to move. To check the PARK (P) mechanism's holding ability: With the engine running, shift to PARK (P). Then release all brakes. Underbody FlushingService At least every spring, use plain water to flush any corrosive materials from the underbody. care to Take clean thoroughly any areas where mud and other debris can collect.