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post #54 of (permalink) Old 14th March 2013
Technical Supremo

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Re: Sanding brake discs

The idea of skimming discs whilst on the car has been around for over 50 years or so. I can remember a system which used a grinding wheel rather that a lathe tool bit. Its advantage was that it had little or no vibration or risk of harmonics. I seen it used on a number of old Jaguars. The down side was that the system just didn't have sufficient mass to absorb and inherent vibrations which resulted in the discs on many occasions ending up out of true.

When new both sides of the disc are machined so they they run true and perfectly concentric to the centre. Unfortunately this degree of accuracy cannot be replicated whilst the disc is on the car.

I notice there is no mention whatsoever of minimum thickness mentioned in the video clip. Such a vital safety spect should not be overlooked.
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