My brake lights wont turn off even when the truck is and my cruise wont engage either????

SOURCE: ABS BRAKE LIGHT ON IN MY SUBURBAN/GMC TRUCK

Try diconnecting the battery for a minute or so, then reconnect it. the computer should reset itself, and hopefully the light will go out.

SOURCE: 2002 YUKON XL Denali no brake lights or cruise

FROM LUSTY KID:

Check your bulbs first, I have lost both headlights on my ford at once on account of the bulbs burning out at the same time. Same thing probably happen, you have one filament out. The lights can work, but if the filament for brake is burnt, you don't see brake lights.

As for the cruise control. Check fuse box first. If OK check vacuum hose to actuator in engine compartment for starters.
Advise:

SOURCE: 2003 Sonoma SLS 6 cylinder 4.3L ABS issue

I WOULD NOT KEEP DRIVING IT.WHEN ABS LIGHTS AND BRAKE LIGHTS COME ON.YOU HAVE BRAKE FAILURE. TOW IT TO DEALERSHIP HAVE IT SERVICE.AND CHECK THE ABS BRAKES SYSTEM .BECAUSE ABS BRAKE SYSTEM IS NOT A HOME FIX.BECAUSE THE ABS HYDRAULIC MODULATOR UNIT HAS LOWER FROM HOME POSITION .IN ORDER TO MOVE THE MASTER CYLINDER FROM UNIT.YOU NEED A TECH 2 SCANNER TO DO THE JOB.TO GET ABS BRAKES TO BLEED RIGHT BEST TO GET THEM PRESSURE BLEED INSTEAD OF MANUAL BLEEDING GET LESS AIR IN SYSTEM.THAT WHY SEE DEALER SHIP HAS THE THINGS TO DO THE JOB.

SOURCE: Hydralulic pump for ABS keeps running after vehicle turned off.

The ABS Control Module is out. Common problem on GMC

SOURCE: 1998 GMC 1500 4x4 4.3L ABS brake problems

Or you could just pull the fuse for the abs and not have abs but you won't wreck from pulsating pedal.