I have a 2002 R1150RT with 68K linked brakes servo assisted . Last week I had a brake failure light appear and loss of my power assisted brakes. Brake failure light flashing fast 4Hz and general warning light on. I bought a new battery as I knew mine was getting weak. Failure light came on again in just a few miles.
I have read every thing I could here and elsewhere on the web and decided the next thing to do would be to bleed the system. With system bleed today including the servo unit it looked for a while like we might have fixed the problem then the failure light again.
Now when the light come on fast 4Hz brake failure light and general warning light. When I pull the front brake lever it does not activate the servo when I push the brake pedal it activates the servo which stays on (run the servo) even when released.
This is intermittent shutting the key off resets the system and brakes function normal with front brake lever activating servo and rear pedal activating servo. then after some time and multiple uses the failure light will come back on.
Need some guidance here whats this sound like and what should I try next.
Hope I have explained this so it understandable
thanks Rick .