Link: Macclesfield MOT & Service Centre
I've had a look in VADIS and I think I can see the valve you mention on the vac pipe going to the servo but in the parts list it describes it as "Contact" so not much help there and I can find it mentioned in any of the workshop manual sections either.
I can see that some engines have a separate vacuum pump but I think it may not be on yours but I would need the VIN to work out the correct engine fitted.
As I mentioned before I would scan the Engine, ABS and possibly even the Central Electronic Module on the off chance there is some relevant fault codes stored.
I did read that the Stability control system can alter the pressure in the servo during the initial stage of application before the ABS pump kicks in so it may having something to do with that, but I'm not sure.
Regards
Sean
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