I have recently been researching a change to a single front (without ABS) caliper and disc for my 2007 with ABS. There are several great threads on this topic. The "why?" question has been beaten to death. If you don't get the reason or don't agree with the thinking, that's OK. Possibly a new approach with lower cost that the 4 piston Moto Master caliper setup? I am getting great reports on the performance of the 2014 690 Enduro, single disc setup. Yes it is a lighter bike with an Enduro slant. But, I am hearing that it has a great feel and good on-road stopping power. With the help of Mark at NMS in Reno, I have been researching part numbers. The 690 Enduro uses a different master cylinder with a caliper that is the part number which KTM has superceded to for the 2007 Adventure. It calls for different sized pistons--30 and 32 mm. I don't know if the original 2007 Adventure caliper used this setup or not. The 690 also uses a master cylinder which is a completely different part number when compared to the 990. I am thinking about a lower cost option to get to a single disc, non-ABS setup for my 2007 990 Adventure. I want to lose the weight and complexity of ABS but maintain decent on road stopping power. In a "money is no object" world, I would order up the 690 master and caliper, source some non-ABS brake lines and charge ahead. Before I do that, I thought I would see if anyone had thoughts on the 690 Enduro's brake performance. And whether or not there is any real difference between the 690/original 990/new 990 part caliper. And the master cylinders too. Any thoughts???