X-Drive causes brake disk to explode with OE biscuit wheel

[CraigZa]

I was driving my X5 E70 40d back from vacation on the Motorway, and got a Tyre pressure warning on my iDrive. I pulled into the emergency shoulder and checked my tyres I could see no damage so reset my tyre monitor.

A short while later I heard a noise from my rear left tyre only to discover I had warn through the run-flat and got to the steel belt. At this point I decided to change to the OE spare wheel.

5km later at about 60km/hr, I heard an explosion, which made me immediately pull over (still on the Motorway). I discovered that the rear left disc brake was on fire and had completely exploded bit of molten disc had fallen into the grass beside the road and started small fires.

The car was collected by BMW on-call, and they have assessed the situation, they are saying that the damage was due to the stability control system (DSC) due to diameter differences of the spare wheel.

Wondering if anyone else has had a similar experience