I have had this issue with my 2012 s1000rr since day 1 with 0 miles
About 1 time of 20 complete stops the front end of the bike shakes. It happens during mild to medium braking but starts shaking at around 10mph to a stop. It never does this while slowing at higher speeds. Only when almost at a complete stop.
I took the bike to a dealer and they could not replicate the problem. It's rare but very discomforting when it happens.
There is a rapid clicking noise associated with the shake.
The shake is not from side to side but rather forward backwards and up and down motion. It may also resemble abs kicking in but it happens under very mild braking. I don't feel the brake lever kicking back at my finger tips but I do feel the vibration through both hands (I think)
The rapidness of the shaking associated with the rapid clicking sound is approx 5-10 clicks per second.
Well add me to the group. I reported this to my dealer who could not tell me the cause. Definitely no pulsing in the lever so if it is ABS it is not from nearing lock up. It occurs exactly as noamkrief reports, at mild brake inputs and near complete stop.
The way this ABS works you will never feel pulsating at the lever, that's old school car stuff. Having said that, I don't think that what you are feeling is ABS, but some other kind of vibration under light braking. If it was the ABS system then I would expect the light to come on. Mine has done this a few times, and braking harder stops the vibration, at least for me anyway.
I had a similar problem with my Ducati. From the time I brought the bike home, the pads began to wear funny. For some reason the bike would occasionally pulse like that when coming to a stop. I changed the pads and it was fine. Okay, the brakes were fine. But I put 9,000 more miles on the bike and the pulsing didn't come back.
I'm not saying it's definitely the cause on the BMW, but you can always pull your pads and see if they are wearing funny. It looked like mild chunking. This is just my shitty theory, but I think the pads didn't fit the calipers properly and would occasionally get cocked.