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Mark has it right. His sources are golden, and he knows his stuff.

"Linked" is a marketing term used by Honda and other manufacturers to refer to a simple hydraulic connection between the front and rear brakes. The most notable version of this is the 'Wing, where the front lever is hydraulically plumbed to most of the front brake caliper pistons and some of the rear caliper pistons, and the rear lever is plumbed to most of the rear caliper pistons and some of the front. So operating the front lever gives you most of the braking up front and some in back, and operating the back pedal gives you most of the braking in back and some in front. It's a fixed, purely hydraulic setup.

BMW's setup is called "Integral" braking, because it's a fully computer-controlled system that takes various inputs (wheel speed, throttle position, suspension compression, etc.) and then calculates the optimal braking force for the wheels. BMW's "Fully Integral" system (as on the K12LT) uses both front and rear levers to control both front and rear brakes (in computer-controlled proportions), and the "Part-Integral" system (as on the K16) uses the front lever to control front and rear, but the rear lever only controls the rear brake caliper. This is useful for more "sporty" riding, where independent control of the rear can have a noticeable effect on suspension settling and chassis stability while leaned over.

So Linked is not the same as Integral, and Fully Integral is not the same as Part-Integral.

Now I've also been told that Part-Integral means that the rear has no connection to the front, at any speed. However, the Integral brake system does take speed into account, so that could be a factor in their programming. I think that speed has more to do with the proportion of each brake used than suddenly giving the rear access to the front, even at super-slow speeds. If the front wheel is turned even slightly when rolling to a stop, you don't want any front brake applied at all . . .
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