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If you machine rotors with a brake lathe, it is vital that you keep the machine well maintained. With today's tight rotor and drum runout specifications, you must make sure that your lathe isn't contributing to excessive runout. In this video series, we will walk you through some steps you can take to ensure your brake lathe is operating correctly. This will help ensure a quality brake job.

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The first part of the brake lathe that we are going to discuss is the arbor. It is important to make sure that the arbor itself does not have an excessive lateral runout.

The AMMCO brake lathe that we are working on calls for a runout of one thousandths or less. When we tested the lateral runout of the arbor, we found it to be excessive (over 10 thousandths).

What do we do in this situation? We must remove the arbor itself and inspect it. Removing the arbor is as simple as loosening the nut at the end of the lathe and removing the bolt. This will allow you to pull the arbor shaft out of its housing.

Once you have the arbor shaft out, it is important to inspect it for any nicks. Clean the shaft with sandpaper to remove any shavings or debris on it.

Additionally, clean the arbor housing with sandpaper. An easy way to do this is to turn on the lathe and press the sandpaper against the housing.

After cleaning the arbor shaft and the housing, make sure to align the witness mark on the arbor with the witness mark on the lathe spindle.

Once you re-install the arbor shaft, check the lateral runout again. If the runout is still excessive, disassemble the arbor shaft, rotate it 180 degrees and re-install the shaft. If the runout is still excessive, you will have to replace the arbor shaft.