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Old 01-30-2011, 03:51 PM
Fordzilla80 Fordzilla80 is offline
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Default Measuring Brake Rotors/Drums

Hey guys, I'm looking to pick up a micrometer/caliper so I can start measuring my rotors and drums to make sure they're in spec, and I was just wondering which micrometer or caliper will suit me the best? I rarely do much brake work, so I'm not in need of high quality stuff, I just want something that will work. Which is better to measure the rotor/drum thickness, micrometers or calipers? Are they the same? Will the stuff at Harbor Freight suffice? Thanks in advance for any help guys!
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Old 01-30-2011, 04:13 PM
coolchris2 coolchris2 is offline
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Default Re: Measuring Brake Rotors/Drums

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Originally Posted by Fordzilla80 View Post
Hey guys, I'm looking to pick up a micrometer/caliper so I can start measuring my rotors and drums to make sure they're in spec, and I was just wondering which micrometer or caliper will suit me the best? I rarely do much brake work, so I'm not in need of high quality stuff, I just want something that will work. Which is better to measure the rotor/drum thickness, micrometers or calipers? Are they the same? Will the stuff at Harbor Freight suffice? Thanks in advance for any help guys!
[edit]
I think they make tools just for what you're talking about to measure rotors and drums.

http://www.marcur.com/Hand%20Tools%2...ng%20Tools.pdf
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Last edited by coolchris2; 01-30-2011 at 04:23 PM.
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Old 01-30-2011, 04:44 PM
STL STL is offline
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Default Re: Measuring Brake Rotors/Drums

If you measure and there is enough left you can have them turned.
Generally they have the minimum allowance stamped on the back.
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Old 01-30-2011, 05:00 PM
Bird76Mojo Bird76Mojo is offline
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Default Re: Measuring Brake Rotors/Drums

STL is right. If you do have to take them to get turned, then the shop will advise you on what to do or if they're salvagable.

Alternatively, you can measure them with a simple set of calipers or a micrometer.


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Old 01-30-2011, 05:05 PM
Fordzilla80 Fordzilla80 is offline
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Default Re: Measuring Brake Rotors/Drums

lol, I know they can be turned, but I wanna be able to measure them myself to see how close they are and if there's even a chance they can be turned. So i'm trying to figure out what's best to use to measure the thickness that's left.
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Old 01-30-2011, 05:17 PM
coolchris2 coolchris2 is offline
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Default Re: Measuring Brake Rotors/Drums

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Originally Posted by Fordzilla80 View Post
lol, I know they can be turned, but I wanna be able to measure them myself to see how close they are and if there's even a chance they can be turned. So i'm trying to figure out what's best to use to measure the thickness that's left.
Just use a micrometer
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Old 01-30-2011, 06:43 PM
Fordzilla80 Fordzilla80 is offline
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Default Re: Measuring Brake Rotors/Drums

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Originally Posted by coolchris2 View Post
Just use a micrometer
Okay, that's what I was taught in Auto Tech, but I wasn't sure if there was a certain type I should use or not. But after looking at pics as long as they measure within the specs and the unit of measure I need then I should be fine. Thanks guys!
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Old 01-30-2011, 07:13 PM
STL STL is offline
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Default Re: Measuring Brake Rotors/Drums

Be sure to measure one side then rotate and measure the opposite side. Do that 4 times to verify they are not warped.
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Old 01-30-2011, 08:38 PM
Fordzilla80 Fordzilla80 is offline
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Default Re: Measuring Brake Rotors/Drums

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Originally Posted by STL View Post
Be sure to measure one side then rotate and measure the opposite side. Do that 4 times to verify they are not warped.
Thanks for the tip man! I won't need to do it on my Ranger anytime soon since the rotors are quite meaty, but the ones on the F100 are crap, and will be good to practice on before I have to actually measure something for real.
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Old 01-31-2011, 06:36 PM
1KOOL1 1KOOL1 is offline
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Cool Re: Measuring Brake Rotors/Drums

http://www.thetoolwarehouse.net/p-25...ools-3377.aspx use one of these
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Old 01-31-2011, 09:48 PM
West West is offline
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Default Re: Measuring Brake Rotors/Drums

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Originally Posted by STL View Post
Be sure to measure one side then rotate and measure the opposite side. Do that 4 times to verify they are not warped.
Doing this will just tell you the thickness variation in the rotor itself. To actually check run out, you need a dial indicator and have to keep the rotor on the truck with a couple lug nuts set snug on it.

Micrometer is good for the rotors, but it will not work for the drums. Drums need their own special measuring tool.
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