406 Cruise Control stops after a few minutes. Not brake pedal switch

The car is a 1997 406 - 4 cylinder petrol engined auto purchased new, now done 270,000 km without any serious issues and no previous problems with cruise control.

Almost all operation of the car has been on motorway under cruise control.

When started from cold, (daytime temperature 20 degrees Celsius) cruise control can be engaged normally but will invariably stop operating after 3 to 4 minutes (less if the temperature is higher) and can not be restarted immediately.

If I continue driving at motorway speed limit of 100 kph occasionally attempting to restart cruise, I usually succeed after about 30 minutes but operation will stop after only 1 to 2 minutes.

When daytime temperatures exceed 30 degrees Celsius, cruise will not work at all.

I have driven the car this way in the two weeks since the problem first appeared and have found it to be quite predictable, i.e. it never operates longer than about 4 minutes, might be restarted after a half hours spell but will then only run for a minute or two and will not operate at all when hot.

Car spent most of yesterday with Peugeot dealer who replaced brake pedal switch and steering column cruise control switch as well as checking all the wiring. None of this has had any effect, the problem remains. I have tested it today on the freeway and it behaves exactly as before.

Dealer, who is not charging me for his unsuccessful repair attempt, says I should talk to an auto electrical specialist.

I suspect the vacuum pump. Any suggestions?

Reply to
Bob Morrison
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The problem turned out to be an intermittent open circuit in the vacuum release solenoid valve(part of an assembly in the engine bay consisting of the vacuum pump and this dud sol. valve in a plastic bag). I was quoted $AUS 1,000 for the complete assembly plus installation as valve not sold separtely. Opeated on the faulty valve re-soldering dry joint(s) at coil ends and everything is working fine.

Reply to
Bob Morrison

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