I have a 2012 GL1800 with a S/A Lehman Monarch II kit with disc brakes.
The brake system has a residual valve mounted on the axle housing where both Honda OEM brake lines connect too. From that value are 2 stainless brake lines that run to left and right rear caliper.
My question is, I really don't understand the purpose of the residual valve with its bleeder, and then how is it used (and in what sequence) when bleeding the entire front and rear brake system.
Side Note: The Lehman brake modification allows for the front lever to operate the front brakes only and the rear brake pedal operates both front and rear.