1999 GMC Sierra 1500 Pickup Owner's Manual - Page 195

c AM415016 Asyou brake,yourcomputerkeepsreceivingupdatesonrearwheelspeed andcontrolsbrakingpressureaccordingly. CAUTION I A Anti-lock doesn't change time need the you to get foot your up to thebrakepedal. If youget too close to the vehicle in front ofyou, to applyyourbrakes if that vehicle suddenly youwon'thavetime slowsorstops.Alwaysleaveenoughroomupahead to stop,even thoughyouhaveanti-lockbrakes. I To Use Anti-Lock: Userearwheelanti-locklikeregularbrakes. Youmay feel the brakesvibrate, oryoumaynoticesome noise outsideyourvehicle,butthis is normal.Let anti-lock work for you, but remember:Your frontwheelscan still stop rolling. If thathappens,releaseenoughpressure on the brakes to getthewheels rolling again so thatyoucansteer. Withthe four-wheel drive option you won't have anti-lock braking when you shift into four-wheeldrive. But youwillhaveregularbraking.Whenyoushift back into two-wheeldrive,youwillhaveanti-lockagain. 4-1 7