Some good info here
http://www.mrtrally.com.au/performance/brakes1.htm
Quote:
Brake squeal
Often a misunderstood problem. Squeal is high frequency vibration often between pad and disc. Most pads have built in "anti squeal shims" or as well as on the calliper. "Anti Squeal" paste or fluid can be used, but resist applying to the friction surface, as it is then also anti brake! It is simply often a way to absorb the vibration. Machining the disc can often rectify the fault. OR in some cases, a big long HEAVY brake, as it may be poor surface, or be careful a situation where the pad has become shiny like a mirror and loses its grip. To fix this, removal of the pad to remove this shiny layer is needed.
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This stuff works a treat too. Supercheap should have this or something similar.