92 chevy lumina dies when braking hard also the cruise control doesn't hold speed. Both of these happen only after 1/2 hour of driving

There are many things that can cause your cruise control to act up or not work at all. This article will lead you in the correct direction on finding a solution to your problem. This article is for any type of vehicle.<br /> <br /> <b>If your cruise control won't hold proper speed, </b>you need to look at the following parts. <br /> <ol> <li>Faulty Cruise Control</li> <li>Faulty Speed Sensor</li> <li>Faulty Vacuum or Vent Valve</li> <li>Faulty Stepper Motor</li> <li>Faulty Transducer</li> <li>Incorrect Cable Adjustment</li> <li>A Binding Throttle Linkage</li> <li>Leaking Vacuum Tank</li> <li>Leaking Vacuum servo diagram</li></ol> <b>If your cruise control surges, </b>check the following parts.<br /> <ol> <li>Faulty Cruise Control Module</li> <li>Faulty Speed Sensor</li> <li>Binding Throttle Linkage</li> <li>Kinked Speedometer Cable</li></ol> <b>If your cruise control cuts out on you, </b>check the following parts.<br /> <ol> <li>Faulty Transducer</li> <li>Faulty Cruise Control Module</li> <li>Short or Open Circuit in Cruise Control</li> <li>Brake or Clutch Switch Adjusted too tight</li></ol> <b>If your cruise control doesn't work at all, </b>check these parts.<br /> <ol> <li>Faulty Cruise Control Module</li> <li>Short or Open Circuit in Cruise Control</li> <li>Faulty Clutch or Brake Switch</li> <li>Leaking Vacuum Circuit</li> <li>Faulty Stepper Motor</li> <li>Faulty Speed Sensor</li> <li>Faulty Transducer</li> <li>Faulty Cruise Control Switch</li> <li>A Blown Fuse</li></ol>