The rear brake works well on my 2012 WR450F. However, I would like it to have more feel, especially on slippery downhills. To me it seems like its either on or off. I rode a 2015 TE300 and loved the feel of its rear brake compared to my WR.
I've done Krannie's trick of introducing air into the brake circuit. That helps, but I don't think its as nice as the TE rear brake.
Is there anything else one can do to make the rear brake more progressive ?