I could just be highlighting just how little I know about motorcycles, but while searching for a cure to the Multistrada soggy rear brake, I discovered how much more there was to brake fluid than just buying DOT4. Apologies if you already know all of this - Brake Fluid - What is Stopping You Cheers Himself
If you haven’t done so already, release the rear caliper and get it as high as possible. Set up a bleed bottle and pump the air out. Due to m/cylinder being close to engine and exhaust, the fluid can get hot. I use Motul RBF 600 for the rear. It’s high temp resistant. There’s a thread on forum about bleeding the rear and different ways of achieving the desired, firm feeling result.
