Quote:
Originally Posted by marinabrian
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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I'll do it that way in the future for sure as I see the value in your advice. Just discovered for myself that just tightening the single torx bolt was dangerous if just tightened without stabilising the rest of the disc. I fitted a new Mtec disc and the run out reading was worse than the reading on the old one that decided me to replace
I went to a wire cup brush on a cordless drill for cleaning the hub as the hand brush just wasn't doing it. Got curious and found just cleaning my old discs got me to 0.08 mm on both fairly easily so they're probably OK for spares in the future with a bit more cleaning and then possibly skimming. I haven't measured the thickness yet.
Left rear hub run out was 0.02 mm and rear right hub was 0.01mm. With the new discs on I have 0.03mm rear left and 0.05mm rear right. Swapped them round while playing with the handbrake and got 0.02mm and 0.06mm.
Swapped back and finished at .03 and .05 again, so decided to leave it at that. Learned a lot from this exercise and appreciate all the pointers.