How to tell if brake disks need replacing?

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17 Oct 2002
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Hi guys,

Over the past week by front brakes (BMW E46 330i) have started to squeal a bit. I've checked the pads and there is loads let on them, as they were replaced about 4 months ago or so. How could you tell if the disks are worn down, and would this cause squealing?

It does sound like a more metal on metal sound rather than just dust, and there was some scoring on one of the disks.

Cheers,

Mal
 
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