I dont know if this will help you
When my ABS light stayed on I had a mooch around the web for a new black box. There are companies who will test and exchange but some will not accept units which have been opened !
I found the following links - I did not use the Companies as my problem was a sensor fault. I cannot report on how good they may be
http://www.carelect.demon.co.uk/index.html
http://www.bba-reman.com/abs.htm
Remeber that running you car without the ABS working will mean a MOT fail
web links
Moderator: RichardW