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07 SL350, 14 BMW320, 05 SLK and 4.6 MGBV8
745 Posts
Brake squeel is the noise produced from the pads vibrating at a high frequency.
The first thing to do is put some grease between the piston and pad - copper slip or specialised grease made by the likes of Mintex.
If this fails, then 3M do a rubberised shim which may cure it.
It is not necessarily the pads vibrating between the piston and disc - if the pads are a tad sloppy in their housing, this too can cause the squeel. It is here where the 3M shims work well.
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