Diff lock engaging and ABS switching off?

[QuattroFever]

Need some help here guys.

When I accelerate my diff lock comes on and abs disengages. and wont switch off till i swerve left or turn to the left????

Seems torque related?? If I accelerate really slowly and gently it doesn't happen.

checked all the hoses and repaired one diff lock enages by switch a bit quicker after this but other problem still there

Disconnected the control unit and the switch was inactive but still the diff locks and abs disengages when I accelerate.

[S-Express]

sounds like a dodgy connection, also sounds like the diff speed sensor is inoperable. sure you haven't got some chaffing going on?!

[GT500]

Sounds like the non return valve has died. Have you disconected the vacuum pipes?
Had look at it in operation?

[QuattroFever]

I took the non return valve (is that what it is ) off last night and blew through it both ends. I guess it must be pretty shagged. blanked it off now and no more problem. Kinda all makes sense once you know. I was expecting a real mare.

Nice one.