CRUISE CONTROL STOPPED WORKING. CRUISE LIGHT ON PANEL WOULD LIGHT UP AND TURN IMMEDIATELY OFF AND CRUISE CONTROL WOULD NOT COME ON. NOTICED SMOKEY SMELL ONCE OR TWICE, BUT NEVER REALLY BAD. WENT OUT TO LUNCH AND LEFT TRUCK IT WAS FINE CAME BACK LATER TO THE SMELL OF SMOKE. DROVE 4 MILES TO DEPT. STORE SMELL GOT STRONGER. THOUGHT IT WOULD BE OK WITH TRUCK SHUT OFF, CAME BACK OUT TO LEAVE AND SMOKE SMELL WAS GREATER THAN EVER. OPEN HOOD AND TOUCHED AROUND MASTER CYLINDER AND DEFECTIVE SWITCH SMOKE BEGAN AGAIN BUT ALOT WORSE. UNPLUGGED SWITCH FROM MASTER CYLINDER AND SMOKE STOPPED. *TR