I just rewatched it and I couldn't see brake dust in the braking zones; do you maybe have a certain corner/lap where you see the brake dust?
Please don't mind the tacky filenames of the videos; they were made very quickly and on the spot
If anything, when the counter says 48/55 (remember the lap counter used to count backwards in those days; so I think this is lap 8. Or lap 7. Whatever) Ted Kravtiz reported that he asked the McLaren pit wall if anything was wrong; but McLaren says everything is alright. I've trimmed the video section when Ted said this and uploaded it to media fire (Youtube would just take them down).
Lap 48/55: http://www.mediafire.com/?u7i4ii1l4sdwpmz
On Lap 47/55 (not sure if this is relevant) but Hamilton's team radio says that he's losing time in S1 and S3 (he was gaining in S2). But what the hell. Here it is: http://www.mediafire.com/?whwaxytdgbftf6s
On 40/55: http://www.mediafire.com/?hc7m5ac7atmwe4l
Hamilton pits when the counter reads 38/55, and feeds into clean air.
On 37/55 Phil Prew says "We may have a right rear brake problem, we may have a right rear brake problem, I'll keep you posted"
On 35/55 Ted speculates on the problem; and then Lewis subsequently retires: http://www.mediafire.com/?ixdd6t0q3rqjibb
Martin Whitmarsh then tells Lewis something was wrong in the data; but there's nothing conclusive. But we can't risk you going into the big stops with a dodgy brake". Here: http://www.mediafire.com/?19wg6d7woj0pb7g
This is Lewis's interview with Lee McKenzie: http://www.mediafire.com/?w4lbqbvql701b3g
I've been playing Lewis's braking actions on 1/5th playback speed on a 61 incher; but even when he locks up violently I don't see brake dust anywhere I'm afraid. There may have been a real brake problem; I'll give you that; but it wasn't one that was giving out brake dust.
I've dug up some stuff on the internet from then; and Ted Kravitz wrote this on his blog; where he says the brakes were alright in that 1st stint:
Ted Kravitz wrote: Some interesting detail on Lewis Hamilton's brake failure. It was caused by a manufacturing error that left a less dense area of carbon material in the middle of one brake pad.
That explains how the brakes worked well in qualifying and were just about all right in the first stint of the race.
But when the pad wore down and hit the 'hole', it quickly wore out, the temperatures went through the roof and total brake failure would have resulted, had McLaren not retired Hamilton on safety grounds.
Except for Ted Kravitz's blog there doesn't seem to be conclusive evidence that anything was wrong with the brakes.