I wanted to go to HU today. I turned the other way around because I noticed that the rear brake is not working. The K75 is from 1993 incl. ABS, the documents I changed about 4 years ago. The last brake fluid change is a long time ago. There are no steel hoses on it, but there is no leak and no inflating. The brake fluid is in it, the discs are not oily. The operation of the foot lever is possible with extremely low force until the stop. I. But there is zero delay. Of what I could find about the search function here is the most likely cause of the footbrake switch. The machine was about 1.5 years ago, can something have been fixed there? She is already 30 years old.