(2Wd 1500 2 Door Ext Cab 2 Wheel Steering Incl Hybrid - 5 Lines) Built for the (99-03) GMC Sierra... All brake lines, installation hardware, and instructions are included. Stainless steel brake lines do several things to improve your stopping distance: they prevent heat build up, they prevent condensation, they eliminate the possibility24218 of hose cracking or busting, and they allow maximum flow of pressure to the brake calipers when the brake pedal is depressed.