What did do to fix it

Rear a ultegra 6700 brake was squeaking and getting worse. Toe-in adjustment done few rides ago no better maybe worse. So today took of rear wheel cleaned rim with acetone and the kool stop pads look great little wear and soft. I hit them with some sandpaper and put them back on. The squeal is now horrible in the stand cannot go on.

Brakes hit rim track fine even but I notice the one side just slightly off nothing I would bother to adjust. Well I moved the brake pad maybe 1/3 of a mm to exactly center. Bingo....the brake is dead silence and grabs rim with tremendous stopping power.

What did I do? I like it when this happens.

On 11/8/2016 8:15 PM, wrote:
Rear a ultegra 6700 brake was squeaking and getting worse. Toe-in adjustment done few rides ago no better maybe worse. So today took of rear wheel cleaned rim with acetone and the kool stop pads look great little wear and soft. I hit them with some sandpaper and put them back on. The squeal is now horrible in the stand cannot go on.

Brakes hit rim track fine even but I notice the one side just slightly off nothing I would bother to adjust. Well I moved the brake pad maybe 1/3 of a mm to exactly center. Bingo....the brake is dead silence and grabs rim with tremendous stopping power.

What did I do? I like it when this happens.


Remove your brake mounting nut, clean and lubricate thread,
install tightly. A loose brake will just scream regardless
of pad quality/angle. Lubricate and torque brake shoe
fasteners as well.

If noise persists, check the brake pivots. A loose one will
harmonically resonate too.

--
Andrew Muzi
www.yellowjersey.org/
Open every day since 1 April, 1971

Thanks Andrew that does make sense I just did it by accident.

Deacon mark