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Old 29th May 2020, 10:40   #15
marinabrian
 
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Quote:
Originally Posted by edwardmk View Post
Finally got the DTI gauge. Run out on rear left hub was 0.02mm and rear right 0.01mm after cleaning. I thought not bad for 130k miles but I don't know if the bearings were ever changed before. Fitted new Mtec discs and was disappointed to find 0.14mm run out on the rear left. More cleaning and I now have 0.06mm run out. Just for academic interest I'm going to clean a bit more and play around to see what's the best possible. You were so right about the importance of the cleaning before fitting. Very helpful.
I always clean the hub with a cup brush in the angle grinder, followed by a dose of brake cleaner, then clock the hub to check for runout.

Then on with the disc, bolt up with wheelnuts fitted with spacers and clock the runout once more.

I find you need to be careful with these, as pulling up the disc with a single screw can lead to inaccurate readings.
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