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On the front wheel the discs are held on by 5 bolts that go through a bobbin and wave washer before entering the thread on the 'spoke' of the wheel. When first produced there was nothing between the disc and spoke. This can cause the top of the spoke to wear away as the wheel is not strong enough. There was an update to put some washers/spacer on the top of the spoke to stop this wear. If the top of the spokes become to worn they can cause the disc to become uneven on the wheel.

I hope the above makes sense. I think it has happened to me and is felt as a pulsing through the front brake lever. I shall try new discs to see if it is just worn discs. However, my question is: has this happened to anyone else? can the spokes be smoothed/filed flat and a spacer put in to even out the lateral play.

Hi
Yes it happened to me.I had a very heated discussion with BMW about the problem,all to no avail i may add.
Chris C sorted out some washers for me which sorted out the excess play.
gus

Johnl - sounds most like cooked discs. When you get them off, lay them on a glass top coffee table and get a feeler guage to them. The larger the gap, the greater the pulse felt at the lever. Seriously buckled discs will cause a most uncomfortable judder when heaving on the brake at high speed.

Hi
Just to add,i didnt have any pulsing sensation.The discs rattled/clunked loudly.
gus