There are I think there are 4 fuses for the abs. Two in you foot well fuse box F18 and F33 then there two under the bonnet FL6 and F06
The brake light on the cluster will only come on with the hand brake applied or you brake res is low.
the hand break switch is located down by the hand break it my be gummed up so it might be worth checking it you will have to pull off the trim to get to it
there is a cluster test you can do to test the lights on the cluster
Have a read of this link fig 35 Ike test you want to do test 2, there is a lot of handy info here for you as well http://www.bmw-planet.com/lib/mini/B...LECTRONICS.pdf
These lights on the cluster are controlled by the body control unit located in the drivers footwell under the trim by the bonnet release, these do suffer from corrosion and cause all kinds of problems, it may be worth disconnecting the plugs having a look at them and the condition of the BCU. Just remember to disconnect the battery
Just a quick thought if the cluster test does not light the lamps, don't go thinking you can just get another cluster and plug it in they need to be coded to the BCU.
Failing that you need to plug it in to a decent diagnostic machine to narrow down the fault
Hope this helps