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Old 04-14-2013, 06:23 PM   #31
GH41
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I wouldn't trust the HF anything to be accurate!!!! GH
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Old 04-15-2013, 10:53 AM   #32
Motomantra
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Rotor run out reading with a dial indicator may be inconclusive due to the rotor designed to float on the buttons.
Try taking a plastic hammer to the high side of the rotor to see if it shifts. Tap, tap lightly so as not to create any more damage.
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Old 04-16-2013, 07:59 AM   #33
slidewayes
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Quote:
Originally Posted by motomantra View Post
rotor run out reading with a dial indicator may be inconclusive due to the rotor designed to float on the buttons.
Try taking a plastic hammer to the high side of the rotor to see if it shifts. Tap, tap lightly so as not to create any more damage.
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Old 04-16-2013, 10:50 AM   #34
MCMXCIVRS
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The correct measure as some have stated is ~0.0055" (the tenthousanths is a best guess using that dial indicator).

However, rotor runout is unlikely to cause pulsation on its own. Runout may cause the brake lever to have too much travel on initial application as the wavy rotor pushes the pad further back leaving excess clearance that must be taken up when the brakes are applied. If you are sensing pulsing, then the problem is thickness variation (also refered to as parrallellism) at various points around the circumference of the rotor. While a fairly large amount of runout can be tolerated (as indicated by the specs), very little thickness variation is acceptable, usually less than 0.002" - 0.003". The variatins in the rotoir thickness cause the pads (and thus the brake lever) to move in and out to follow the rotor.

Use a micrometer (calipers will not work very well for this as they cannot measure a small enough area on the rotor faces) to measure the thickness of the rotors at multiple points to determine if they are all the same or very close in thickness. Also, look for obvious high spots that might indicate hard spots on the rotor caused by overheating.
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Old 04-19-2013, 11:59 AM   #35
scootertrog OP
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Update - Received replacement rotors and problem solved. :)
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