One of the bike maintenance tasks that seems to be overlooked is the bleeding of brake fluid at the recommended interval. I see lots of brake fluid reservoirs on bikes with brake fluid the color or honey or a very dark beer. It's supposed to be clear. Dark brake fluid is particularly bad when you have servo brakes on an ABS system. It can lead to expensive ABS module or pump replacement.
Bleeding brake fluid isn't all that hard but it usually takes 2 people to do it. One person opens the bleed screw, while the other gently pumps the brake lever. The person on the bleed screw has to be careful not to entrain any air bubbles in the brake fluid since it can take forever to get the air bubbles out of the system.
There is a product called "speed bleeders" that makes bleeding brakes a one person job and really reduces the likelihood you will entrain air in the system. Speed bleeders are basically a one way check valve that replaces your existing bleed screws on your front and rear calipers. You just screw out the old ones and then screw in the speed bleeder. On some BMW's they recommend that you file down the pointy tip of the bleed screw before inserting it into the caliper. This just makes it easier to seat the speed bleeder. I had to file down the screw for my rear brake but the front calipers seated fine without extra effort.
Anyway. I put them on my K1200GT before my annual brake fluid bleeding operation. They worked just as promised. I was able to bleed the brakes by myself and the whole process was super quick. Actually, it seemed like it took longer to protect the painted surfaces of the bike from any possible splashing of brake fluid than it took to bleed my servo brakes.
Note: on a servo ABS bike, you have two fluid circuits. One is the wheel circuit, which runs between the reservoirs (front handlebar and under seat) and the calipers. This circuit should be bled annually. You will need 3 speed bleeders to swap out, 2 for the front and 1 for the back. You can find out which ones you need on their web site.
The other fluid circuit is the ABS control module. It takes 6 more speed bleeders for the ABS module of the KGT. This circuit should be bled every other year. It also takes a special wrench (home made) to open the bleed screws. You might want to leave that circuit to the BMW dealer. If you decide to make it a DIY job, there are some YouTube videos that will walk you through it.
You can also get speed bleeders for your clutch circuit too. But once you install them, they make the changing of wheel circuit, ABS module or clutch fluid a whole lot easier. And with a typical brake fluid flush at a BMW dealer costing north of $300 they will pay themselves off the first time you use them.