Cheers guys, I get the brake works now (well I had a guess anyway) what was throwing me was the terminology between variable resistor and potentiometer.But if you take the word litteraly it just means potential meter, should have got that myself really!
Now im just trying to figure out how the variable ohms for the controller works in the black box! but i guess that may take longer to explain!
anyway sorry maltese for taking over this thread a bit!