I’m a few weeks away from my one year anniversary with my GSA. BMW calls for a brake fluid flush at year one and every two years after that. I called my local dealer and was quoted $215.00. Yeah, I’m not paying that. I grabbed a $7.95 bottle of DOT 4 from my local Vatozone and did it myself. I saw on a youtube video a guy used a cargo strap on the rear brake pedal to activate it. It worked like a charm. For general maintenance items the GS platform is very easy to work on. I will have to pony up at 12,000 miles for the dealer to check the valves and cam timing, those two items are above my skill level.