annoying brake squeal - please go away

[Barry]

Don't know if the brake caliper have been overhauled. They may need a strip and clean with new seals to free up the pistons.

One possible cause of brake squeal is that when you release the brake lever the caliper pistons are not being retracted slightly by deformation of the piston seals. There should be the thinnest air gap between the pads and the disk. Just a few thou. When the brakes are applied the square section seal in the caliper piston distorts slightly as the pads are pushed against the disk. When pressure is released the seal returns to normal retracting the piston slightly.  That's the theory and it works when everything is clean and free to move easily.  When the calipers get gummed up inside then the piston won't retract and you can have the pads dragging on the disk all the time which causes them to get glazed over leading to brake squeal.

[steve hawkins]

I hope your disks are good.....If you have any radial cracks between the drill holes in the disks, they are toast.  Oh and they often screech loudly when in this condition...Don't ask me how I know.....

Rev. Light

[DgM]

I dual disc'd my 1983 R65 - Brembos - and have enjoyed the more accurate though not THAT much more powerful braking force.  When heated up during / after mountain riding brakes make nary a sound.  Cold, as in city driving, brakes ALWAYS squeal loudly.  Squeal gets attention of pedestrians - especially those head bent down regarding 'smartphones' while jaywalking - as R65 emits hardly more than a whisper at low speeds.