I know I'm a bit different having drums at the back. My cars off the road for its engine refit so I can't do any tests at present but I'm pretty sure I could lock up all four wheels when doing an emergency stop at slow speed. It's one of my pre-MOT tests that I do in nearby street. (Maybe my tyres were a bit rubbish?)
I fitted the BMW rear brake restrictor (bias valve?) which limits the amount of pressure going to the rear wheels to stop them locking up before the fronts. (These are not fitted to ABS donors as the ABS prevents it in a different way).
I am fairly sure that Patrick fitted the same to his car and he has disks all round.
It's BMW part number 34331152494 (you can look it up on Realoem.com)
Unfortunately, I can't find a picture....
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