Witness marks

Often when conducting an mot I notice something before I begin to concentrate specifically on a set  of components.

Such an item were the presence of these polished spots on the subframe and driveshaft on a VW Polo as an indication or “witness” that something was amiss.

polished spots on driveshaft and subframe

Further investigation by looking at the driveshaft revealed that it was bent as you can see in the image above.  However the full extent of the distortion and runout is best shown in the following video.

Hearing the constant knocking from this area once in the roller brake tester made me question the hearing, common sense and sanity of the driver !

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