Brake Rotor Runout Measuring

Rusty

Top of the gauges are Starrett, Brown & Sharp. Which I have both, plus a cheaper CDI. All are 1 inch travel. You can get cheaper gauges that won't break the bank. A good way to measure rotor run out. Remove the tire, remove the rotor. Clean the mating surface of the hub and rotor to remove any dirt, etc. Install the rotor and lugs. Torque the lug nuts. The best place to mount the gauge base is on the steering knuckle. But because it's aluminum. You have to clamp it into place. Can't use a magnet base. You can get the gauge at AutoZone, Advanced Auto etc.

Google

https://www.google.com/search?q=meas...hrome&ie=UTF-8

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浪人 - 殺し屋
"The Difficult Anytime, The Impossible By Appointment Only"
http://www.the370z.com/members-370z-...o-journal.html

240se

I'm going to go by Harbor Freight and pick one of these to try out. Can always return it if it doesn't work for me.

clamping dial indicator

Or this

machinists dial indicator

magnetic base

240se

So I bought the clamping dial indicator from Harbor Freight and measured the runout on my new front rotors. I used a feeler gauge to validate the dial indicator. My thinnest feeler gauge was .002" and the dial indicator read .002".

Max runout is .0014" which is not much. I was just over .001 on my passenger side and .002 on the divers side. I pulled the divers side rotor and changed positions with respect to the hub a few times and got it down close to .001".

I wish I had the dial indicator before I pulled my old rotors off so I could have measured the runout on them because I did have some brake vibration on the track that I do not think was a pad bedding issue.

For people who have measured their runout after having brake vibration, how much runout did you have?

Rusty

You might be breaking new ground asking for rotor run-out. Not much out there.

__________________

浪人 - 殺し屋
"The Difficult Anytime, The Impossible By Appointment Only"
http://www.the370z.com/members-370z-...o-journal.html

240se

I will keep measuring the front runout when I have the wheels off since it only takes a few minutes.

I went to replace my rear rotors and measured the runout of the old ones and they were both around .001". Well below the .0022" limit for the rear. They have very little wear and no visible cracking so I left them on and didn't change them.