TT (Mk1) Discussion Discussion forum for the Mk1 Audi TT Coupe & Roadster produced from 2000-2006

Combi Valve update.

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Old Oct 31, 2008 | 09:08 AM
  #1  
CartoonDog's Avatar
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Default Combi Valve update.

I went to a dealership and tested (and subsequently purchased) a combi valve. For the record if you are going to test your valve - when you draw vacuum on the port, it should NOT leak out the top small hole. I cannot tell you what the small pin hole is for, except that it will let the vacuum out if the internal diaphram is ripped.

Combi valves seem to go for $150-186.

Cartoondog.
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Old Oct 31, 2008 | 09:28 AM
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DumpTTruck's Avatar
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Default It's there to make sure the pressure behind the diaphragm stays atmospheric>>

and doesn't affect the operation. Its also handy to tell if the diaphragm is blown
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