Cruise control works intermittantly--but rarely on 1999 Volkswagen Passat

Have had this problem for 2 yrs, mostly just don't bother, but would be nice on trips to have the cc work. The odd thing is, it works occasionally for 4-10 miles or so, then cuts out by itself. But mostly, it will not work at all. I have had the cruise control electronic unit replaced, which did not help. I've been leery of throwing more good money after bad. Suggestions?

by in Clemmons, NC on April 18, 2009
2 answers
ANSWER by on April 18, 2009
Do both of your brake lights work? If not fix that and see how your cruise behaves. Other than that their are a number of possibilities , from the multi function switch , brake light switch , clutch switch , control unit and the wiring in between. The servo is vacuum operated so more possibilities there. This really needs to be diagnosed properly , per the factory manual to avoid wasting more money.
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ANSWER by on April 20, 2009
I have an 02 Passat....had it in to the dealership 7 times for a very similar problem...cruise would cut out on its own...and after several attempts, it was some type of brake switch that needed to be replaced. This also fixed an acceleration problem I had as well....apparently my VW dealership had to contact the Regional VW rep to figure this out.....
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