My T5 2012 Crewvan needs new brake pads & rotors, both front and rear after only 42000k
VW of course insist that the pads & rotors are designed to wear at the same rate to ensure good brake performance and they definitely do not machine the rotors as both get replaced.

Firstly, does anyone know what size the brakes required are being diameter & width.

Secondly, what are your experiences with DIY aftermarket brake work?
are aftermarket rotors and/ or pads better?
Do aftermarket rotors last longer?