I thought I had done the front diff on my TD6, and may still have.
http://www.fullfatrr.com/forum/topic18530.html
But on investigation I find I have a decent size hole in the bottom of the front right air spring. I recall hearing it go. My car has done over 260,000kms.
So my question is this
"If the spring is playing up will it cause the wheel sensors to fault and cause the abs/dsc wheel braking to occur. I particular driving uphill on a damp windy road"
I am thinking this could happen if the wheel is not being pushed down onto the road as it should and could then be skidding on the surface. A long shot I know but I will replace both front springs first then look at what else is happening.
I love the way these cars try and fool us.

Adrian VW Amarok 2014 Highline auto

When my airbag burst the car felt like the abs was kicking in (grinding feeling) around every corner. It all rectified itself when the new strut was fitted. 2003 Vogue 4.4 V8 Java Black

Me too. Both my front airbags went within a week each other. There was grinding and wheel spinning and all sorts of nastiness. MY2010 TDV8 Vogue Ipanema Sand
2002 V8 Vogue Oslo Blue - Gone.

New Dunlop front struts fitted yesterday morning. All went in with relative ease apart from from dropping the socket into the engine bay when torquing up the strut top bolts. I had to remove the undertray to recover it. Funny thing is it didnt cure my wheel bearing noise

Adrian VW Amarok 2014 Highline auto