Originally Posted by Rossco

They weren't new, He'd done 10,000 km on them without issue (apart from smoking his Lucas pads) before having them machined & fitting QFM pads.

Gordo thinks he didn't bed them in fully after having them machined prior to Collie... he said he felt them start to shudder after his second lap....they'd only done 500km since machining/new pads.

I had the exact same discs (protex Ultrastreet) hot enough to burn the paint off the hubs last time I did Collie & still have no cracks 30,000 km later?

My car is due for rear discs in a month or so.....will be going RDA slotted rears.