Hi, Sound like a problems with the cruise control ECU these can be repaired, see ECU Repair Centre, Cruise control repair service and remanufactured units, Tempomat Steuergerät revision for more information. Goodluck.

Hi, Problems with the cruise control are very often due to a bad amplifier. See ECU Repair Centre, Cruise control repair service and remanufactured units, Tempomat Steuergerät revision for more information, they can also repair these units. Goodluck.

Hi, This problem sound like a bad cruise control amplifier and not like a vacuum problem. These amplifiers brake down quite often but they can be repaired, see ECU Repair Centre, Cruise control repair service and remanufactured units, Tempomat Steuergerät revision Goodluck.