Squealing Rear Break

[Moe]

The other day I was coming down a hill and had to stop quickly at the bottom and my back brake squealed.... Now it won't stop.... Is there a way to cure this?? It will drive my insane if it keeps at it!!

 

[Shut Up Legs]

Try adjusting the "toe in" - see here: http://www.bikeradar.com/au/gear/article/workshop-step-by-step-guide-to-quiet-rim-braking-22677/

 

[raleighnut]

Might be an idea to either file or sand (dress) the surface of the pad back to flat and remove any 'residue' that has embedded itself in the pad surface, a good clean of the brake track on the rim with soapy water wouldn't go amiss either (then a good rinse off ), then refit and set the 'toe in' if it is possible with the caliper/pad you have (some cannot be adjusted, some can)