Zmachine said:I have exactly the same handbrake problem.
I've just taken mine into an independent BMW specialist (trusted and used for a while now) and he had diagnosed the handbrake ratchet wheel as worn. This is a common fault apparently.
If you lift up the trim and look down into the centre console void (just behind the handbrake) you can see the ratchet wheel. Two of the teeth have worn on mine and this is where the fault is.
A new handbrake ratchet is £85 from BMW. Centre console trim has to come out for fitting so it's a fair bit of labour to fit too, apparently.
Hope this helps, I'm waiting for repair too so in the same boat!
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Definitely sounds right to me