1998 GMC Safari Owner's Manual - Page 378

Ignition Transmission Lock Check While parked, and with the parking brake try to turn set, the ignition key to LOCK in each shift lever position. 1 The key should turn to LOCK only when the shift lever is in PARK (P). The key should come out only inLOCK. Parking Brake and Automatic Transmission PARK (P) Mechanism Check Park ona fairly steep hill, with the vehicle facing downhill. Keeping your foot on the regular brake, the set parking brake. To check the parking brake's holding ability: With the engine running and transmission in NEUTRAL (N), slowly remove foot pressure from the regular brake pedai. this untilthe vehicle is Do held by the parking brake only. 0 A CAUTION: When you are doing this check, your vehicle To check the PARK (P) mechanism's holding ability: With the engine running, shift to PARK (P). Then release all brakes. or could begin to move. You others could be injured and property could be damaged. Make sure there is room in front of your vehicle in case it begins to roll. Be ready to apply the regular brake at once shouldthe vehicle beginto move. 7-44