I have had my multi from new 2017. I use my rear brake a lot as a bit old fashioned scrubbing into corners. This guy on youtube is explaining how to make the rear brake better because your cat heats up the fluid & water gets in there.???? Anyway have a look & see what you think. My cat pissed off a long time ago Me-owe. TERMI. My rear brake works perfectly as designed, not to lock the rear but to slow you down a bit. Seems this guy who's clearly advertising Castrol products can lock up his multi even with ABS. Seems a load of bollocks to me but some of you on here do complain of your deri-air being ineffective.
He's the same guy who I got the heads up about the greaseninja chain spray tool. I don't have issues with the rear brake on my enduro 2016.
The adventure has a bigger brake pedal than the S. I have DVT Pikes Peak and put this on and made a big difference http://www.altrider.eu/altrider-dualcontrol-brake-system-for-the-ducati-multistrada/pid/2178/cid/6