My brakes have started to make a high pitch squeak when I put them on. How can I stop them making this noise ?

MB, June 2009

or if pads ok clean of excess dust and copper grease non friction side of brake pads.

roger, June 2009

not all cars use a warning light connected to the pads, other use a piece of bent tin mounted on the side of the pad, when this comes into contact with the disc due to reaching wear limit, the bent piece of tin vibrates/squeals like hell ,jack the car up, drop a wheel off, and inspect the pads.repeat on the other side replace the pads as a complete set.

wirecutterman, June 2009