[Tatsfield]

Pads and discs need to be matched for hardness. Some discs are deliberately made of softer steel to maximise grip and need softer compounded pads to provide grip without tearing the surface off the discs. I'm not sure about Volvo but a previous car I owned wore discs out quickly if you didn't use OEM pads with OEM discs and further down the line even some of the OEM pads were harder than optimum and you needed to buy OEM and check who manufactured them! Volvo discs may not be so delicate but I'd always seek to match the pad supplied to the disc supplier.

Many owners have the mistraken belief that fitting track or racing pads will give them better braking when these track pads are made from very hard compound for very high speed braking with very hard discs and provide little grip on road discs at road speeds and wear out the discs very quickly. But they do get to put a "Racing" sticker on their bumper!