Hi all, picked the bike up from having a mot and the tester said that he’d given it an advisory because the front brake lever was creeping and loosing braking force when applying constant pressure …. he did go on to say that there were no leaks and was fine to ride … it’s not something I’ve really noticed in the past but now it’s been flagged it’s playing on my mind…..is this normal for an ABS set up or does this sound expensive? …. hope not it only had a 15000 mile desmo service a few months ago & nothing was said then …. thanks all.
Sounds to me like a faulty master cylinder where the fluid is leaking past the seal internally under pressure. I experienced this on a Scrambler, not mine, that had seen accident damage where the brake lever was struck by the wing mirror of an oncoming car.