1998 Buick Century Owner's Manual - Page 338

Ignition Transaxle Lock Check While parked, and with the parking brake set, try to turn the ignition key to LOCK in each shift lever position. .e The key should turn to LOCK only when the shift Park on a fairly steep hill, with the vehicle facing downhill. Keeping your foot on the regular brake, set the parking brake. To check the parking brake's holding ability: With the enginerunning and transaxle in NEUTRAL (N), slowly remove foot pressurefrom the regular brake pedal. Do this until the vehicle is held by the parking brake only. lever is in PARK (P). The key should come out only in LOCK. (P) Parking Brake and Automatic Transaxle PARK Mechanism Check To check the PARK (P) mechanism's holding ability: With the engine running, shift to PARK (P). Then release all brakes. Underbody Flushing Service When you are doing this check, your vehicle could begin tomove. You or others could be injured and property could be damaged. Make of your vehicle in case sure there is room in front it beginsto roll. Be ready to apply the regular brake atonce should the vehicle begin to move. At least every spring, use plain water to flush any corrosive materials from the underbody. Take care to clean thoroughly any areas where mud and other debris can collect. 7-16