1999 GMC Sierra 1500 Pickup Owner's Manual - Page 98

Features & Controls Propshaft Brake Burnish Procedure If youhave a 3500 HD Model,itisrecommendedthatthepropshaftmounted parkingbrakebeburnished aspartofthenewvehiclebreakin.Theparking brake will workbestafter it hasbeenburnishedfollowingtheseinstructions. Make 10 stops,usingtheparkingbrakefootpedal,from20mph(32km/h) about 2 112 miles (4 km)apart. In betweenstops,drivethevehicleat mph(32kmlh). 20 Torque Lock Theparkingbrakeshouldbesetfirstwheneverleavingthedriver'sseat. If youareparkedon a hill andthetransmissionisplaced in P (Park)before the parking brake is set, the weight of thevehiclemayput too much force ontheparkingpawl in thetransmission. It maybe difficult to pull theselector To preventthis,theparking leverout of P (Park).Thisiscalled"torquelock." P (Park). brakeshouldbeset BEFORE movingtheselectorleverto Whenpreparing to movethevehicle,theselectorlevershouldbemovedout of P (Park) BEFORE releasingtheparkingbrake.Settheparkingbrakefirst, thenreleasethetransmissionfrom P (Park),evenonlevelsurfaces. If "torque lock" doesoccur,youmayhave to haveanothervehiclenudge your vehicle uphill a little to takesome of the pressure off the transmission whileyou pull theselectorleverout of P (Park). Shifting Into P (Park) (Automatic Transmission Models Only) 1 CAUTION It can be dangerous to get out of your vehicle if the shift lever is not fully in P (Park) with the parking brake firmly set. Your vehiclecan roll. If youhavelefttheenginerunning,thevehicle can movesuddenly. You or others could be injured. TO be sure your vehicle won't move, whenyou're on fairly level ground, use the steps that follow. If you have four-wheel drive and your transfer case is in N (Neutral), your vehicle will be free to roll-even if your shift lever is in P {Park). So, besure the transfer case is in a drive gear-not N (Neutral). If you are parking on a hill, or if you're pulling a trailer,alsosee "Parking on Hills9'or "Towing a Trailer" in the Index. I 2-30