If you suspect a warped rotor, you can use a dial indicator to check the run out of the rotor. It can also be used to check run out on many other parts like cranks just as one example. They are available from many suppliers in a wide range of prices.
Here's one posted by "Capital Jack"...
Rotor and Crank Runout Gauge - Harley Davidson Community
Here's one posted by "Capital Jack"...
Rotor and Crank Runout Gauge - Harley Davidson Community
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