There are a few companies that do specialise in the selling and maintenance of treadmills so maybe contact one of those companies (google for treadmill repair)
well i have rang round every were i can get the motor for a £150 but nobody sells the brushes.
ghurd you say they can be filed down to fit, is that the differance between all brushes the length? so if i get some brushes from a washing machine motor with a little bit of fileing they should fit?
hi ian. have a look for lucas dynamo brushes , they should be plenty wide enough and as gurd suggested just file them down to the size you require. donnie.