Generally, the ABS light comes up when you turn the ignition key on, the EMS runs through its check cycle to make sure everything is kosher and light goes out after the first complete revolution of your wheels. Depending on the model, if you deactive the ABS the light will flash on and off to remind you the ABS system is deactivated. To deactive ABS you'd normally swith the bike on, wait for the check cycle to complete, hold the ABS button for a couple of seconds until the light starts flashing and release the button. All pretty simple really. What you might not realise it that the new Integral ABS also has full diagnostic control: all functions and sensors are permanently monitored by the system’s electronic “brain”. Compared to former systems, the duration of the initialization phase after switching on the ignition is now much shorter. Any malfunction (if there is one) is saved in a non-volatile memory and can be accessed in the workshop later. Should the electrical or any electronic components break down the control valves are moved mechanically (by springs) to their basic setting, so there's always a direct hydraulic connection between the brake controls and the brake calipers, just like a normal brake system without ABS. The brakes then operate as usual in terms of brake power and application, only the ABS control and, if you've got it, the integral function are no longer available.On the latest R1200GS and R1200GS Adventure, you've the option to deactivate the ABS for off-road use but even when it is deactivated the system maintains its integral function, which can prove quite helpful when riding off-road. For example, to hold position on a slope with loose ground beneath you, all you have to do with Integral ABS (even if it's off) is pull the hand brake lever. This applies the brake on the rear wheel, keeping the bike safely in position and preventing it from slipping backwards. Setting off in such a situation is also easier with this system, since you no longer need a foot to apply the rear brake and you can use both feet for extra support on the ground - useful in situations some people manage to get themselves in on last week's CCA 😀I don't know about your 'grating' sound. Maybe you've got some crap on the brake discs or a wheel bearing out of sorts. I can't imagine it's something up with the ABS.Personally, I don't miss the ABS (my Dakar had it) and don't care that I don't have it on the HP.
