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Nov 7, 2014 | 09:44 AM

Reece64

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Intermediate

Joined: Mar 2014

Posts: 28

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From: chicago

Need some help

How can you tell if your front rotor is warped. Bike shakes at low speeds. I tried everything else from checking the neck to having tire rebalanced.

Nov 7, 2014 | 10:32 AM

mkguitar

Extreme HDF Member

Joined: Sep 2010

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From: Phoenix '53, '88, '09 Big Twins

a dial indicator is used to check for warping.

or you can make a fixture with a pencil the tip just shy of touching teh rotor, turn the wheel slowly and see if you get pencil marks showing high spots...the low spots unmarked

or you can take off ( new bolts needed for reinstall) and place on a sheet of glass- measure around the edges with a feeler gauge.

Mike

Nov 7, 2014 | 10:36 AM

Hogpro

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Joined: Aug 2005

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And Harley's spec for rotors is .008" Usually the brake lever will pulsate when the pull the brake lever if the rotor(s) are warped. If it is bad the bike can shudder back and forth as it comes to a stop.