People will tell you their iPhones can do almost everything, but it seems one thing they cannot do is safely stop a Porsche 911 at 40mph. The revelation comes from a strange You Tube upload from EverythingApplePro a channel dedicated to iPhone reviews.

The video features an experiment to see if iPhones can be used as replacement brake pads. Using a Porsche 911 with adapted callipers from a 911 Turbo, two iPhone 5s’s per wheel in the front and 2 iPhone 4s’s per wheel in the rear were fitted in place of the brake-pads to see if they could actually brake the Porsche at different speeds and be left as functioning devices.

20mph it seems was no problem for the iPhones with the Porsche brakes working normally. However, when the braking speed was increased to 40 mph the iPhones caught on fire. Having put the fires out the theory was then tested at 60 mph with the brakes not surprisingly totally unresponsive. Predictably at the end of the experiment the iPhone’s were completely disintegrated beyond repair.

The moral of the story, don’t use iPhones as brake pads, might seem amazingly obvious and wasting eight devices to find out a little extravagant. However, when you consider that the video was produced by an iPhone reviewing specialist and clocked up almost half a million hits in its first day,  you can see that as a form of advertising it perhaps wasn’t that expensive.