On disks there should be no deep grooves (appeared as a result of influence of a dirt or strongly worn out колодок). Otherwise these grooves deeply врежутся in new brake Pads that will essentially reduce term of their service and, besides, will lower brake influence.
The brake disks damaged by furrows can be processed on a lathe, in a case if they not истончились as a result of long service life till the minimum size (look the table below).
It is necessary to replace too thin disks in pairs.
The bluish shade of brake disks has no value.
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