Hi, I have just done this last week on my coupe, but the cable tensioner would not latch. solution was to push it in with screwdriver and then jam it with a piece of plastic house window trim against a crossover metal brace in the vicinity. It needed to be approx 35-40mm wide to do the job and I bent it about 15 degrees in the vice so it would go under the handbrake lever. With shoes adjusted, I now have a handbrake! i think it just scraped the MOT last year. It seems to be a BMW anomoly that you MUST release the tensioner, if you don't do it , it will just not hold on the handbrake. I fitted new discs and shoes 2 yrs ago, and could not understand what I was doing wrong. Knowledge is king! Stan.