Tony:

Why do quite a few people experience the same issue when they fit big brake kits? Is it something to do with the bigger more powerful brakes amplifying a problem that was already there (low voltage signal as u state)? I know Rainbird had that switch on his car as he said often cossies pulse at low speeds when coming to a stop - once BBK is fitted? I recall PON saying something similar.

If you have an even better piece of kit you can watch the output on a graph and dodgy abs sensors are really obvious (appreciate most people don't have a scope like that).

Cheers
RW