had similar issues with the brakes on my bike (not a 650GT), nothing out of place but it makes that exact same sound. turns out there is a number of pebbles/stones stuck between the pads and disc, which makes that sound at low speed. After a very thorough blow of compressed air it thankfully went away... might be the same case with yours.
had similar issues with the brakes on my bike (not a 650GT), nothing out of place but it makes that exact same sound. turns out there is a number of pebbles/stones stuck between the pads and disc, which makes that sound at low speed. After a very thorough blow of compressed air it thankfully went away... might be the same case with yours.
Yup most likely it is.