Brake discs
Excessive wear
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            Surface grooves
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            Deep grooving
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            Radial cracks / 
blue spots
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Colouring
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            Surface distortion 
and/or cracks
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            Detached or 
distorted Hub
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            Blue spots / 
darker colour
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            Distortion of the
 hub surface
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            Dirt or rust
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            Detached disc hat
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            Disc grooving
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            Disc surface 
contamination
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            Unbalanced 
wear
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            Unbalanced wear 
of brake pads
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