Half way around the red trail at swinley and a resonating pitch can be heard. I quickly find its my bike making the noise.
I mange to get round the rest with a front brake only with the pitch noise along for the ride.
I finally got chance to put stumpy up on the maintenance stand and find the rear pads have worn almost to the spring pushing the pads together.
Took them out and it looked like on piston was pushing more than the other and the pads had worn unevenly.
I swapped them round then spent ages getting the wheel on as the gap always ends up bring less than the rotor when you change pads.