Spotted this on one of the social media platforms. Apparently this is a risk if you are using vented discs but in this case they had been used for racing and had got extremely hot.
Vented Discs Beware
information about the MGB and MGB GT classic cars including news and reviews, techs and specs – also updates on repairs, servicing and diy modifications I do on my own MGB Roadster
MGB tips mods and maintenance 