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Old 04-25-2018, 02:46 PM   #1
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A weird bit of trivia?

I've found a few online sources that state the Ford OE part number 5R3Z-2C026-AA (Rear disc brake rotor for 2005-2014 Mustangs) has a thickness of 19mm.

I've used a micrometer and measured 19.30mm on the driver's side and 19.25mm on the passenger side. The passenger side caliper is currently seized (I'm going to replace it this weekend) so the tiny amount of extra wear on the rotor makes sense.

I've verified the accuracy of the micrometer so I'm assuming the reason why my rotors are thicker than 19mm is due to rounding off the published values or converting between Imperial and Metric values or both.
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Old 04-25-2018, 03:48 PM   #2
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19 mm is likely the minimum thickness allowed before the rotors are considered to be too thin to be safely usable.
The rotors should have the minimum thickness specification written on them somewhere.
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Old 04-25-2018, 05:18 PM   #3
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The minimum thickness according to the online 2011 Mustang workshop manual is 17.4mm. Besides, would a company selling a brand new rotor provide minimum thickness specs or would they provide the current dimensions?
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Old 04-26-2018, 06:38 AM   #4
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You also have to consider a rotor will never wear perfectly even, so that plus the pad deposit (there is always a transfer layer of pad material when pads are bedded) will cause discrepancies in measurement. That's my guess at least.
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Old 04-26-2018, 11:37 AM   #5
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Quote:
Originally Posted by CC2099 View Post
The minimum thickness according to the online 2011 Mustang workshop manual is 17.4mm. Besides, would a company selling a brand new rotor provide minimum thickness specs or would they provide the current dimensions?
They are providing the new, unused thickness spec.
And yes. That is the "rounded off", or "rough" measurement. There is probably some variance in the final measurements due to the cutting bits in the lathe wearing down slightly over time.

If you are concerned about the rotors being slightly thicker than the factory specifications, or that they are slightly different thicknesses between the two sides, it is perfectly acceptable as long as they are thicker than the 17.4 mm minimum.
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Old 04-26-2018, 12:15 PM   #6
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not an answer but .3 mm = .011"
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Old 04-28-2018, 10:27 AM   #7
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Quote:
Originally Posted by straybullitt View Post
If you are concerned about the rotors being slightly thicker than the factory specifications, or that they are slightly different thicknesses between the two sides, it is perfectly acceptable as long as they are thicker than the 17.4 mm minimum.
No, not at all concerned. I just thought it was a bit odd, that's all.
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