I'm currently checking out a brake system fault on an '03. Details - when the ignition is turned to on the outer left red light "Brake Failure" starts flashing immediately at 4 Hz. Red brake system light beside it glows steady red. The instant either brake pedal/lever is touched, a servo starts to run and does not stop till the key is turned off. Moving off makes no difference, the system continues to behave the same. Rear brake feels to (still) have power assistance, front brake does not. The fluid has not been flushed in this bike for at least 5 years. I would do a system flush if I thought it would nelp, though it will be a problem if the servo will not stop running. As an aside, this bike has also had an incorrectly sized rear tyre fitted. It currently has a Dunlop Sportmax radial 170/60 17 which is of course not reinforced, whereas the correct size is 160/70 17. The different profile and aspect ratio calculates to 10 mm difference in tyre height (radius), so 20 mm on the diameter, which is approximately 62 mm less per wheel rev than standard. Technically, does anyone know what the ABS system can tolerate in respect to differeng wheel sizes, I would think not too much given the 120 sensor positions per ABS ring. All advice gratefully accepted, thanks, Dennis.