Audi S2 Abs And Lock Diff Turns On And Off

[terremoto]

Hi, I Have A Problem In My S2, At 3000-3500rpm The Abs And Lock Diff (green Light) Turn On And Off. I Desconnect The Switch But Problem Is The Same. I Disconnect The Yellow Hose Of Rear Diff And The Abs Turn On And Off But The Green Light No.

Thank You

[GT500]

Your non return valve ( small cylinder shape black and white in the vacuum line) is dead.

[Tonks4x4]

It's under your back seat if you were wondering where it was located

[terremoto]

Yes, the non return valve is dead. Thank you very much.

[S2central.net]

Well spotted GT500 - extra beer for that man !