Front rotor warp? Need technical input! - Road Glide Forums
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post #1 of 15 (permalink) Old 08-27-2011, 03:25 PM Thread Starter
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Front rotor warp? Need technical input!

I have a aggravating brake pulse in the front wheel brake. Suspected a warped rotor but when I checked it with a indicator it shows a max of .007" run-out. I was thinking of ordering a new rotor but I would not think that .007" would be enough to be an issue. Any thoughts?
BTW: I'm running a single front rotor with stock 4 piston caliper on an 06.

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post #2 of 15 (permalink) Old 08-27-2011, 03:30 PM
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Just a guess here. Single non floating rotor would be a little more aggressive in the pulsing than with two rotors.

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post #3 of 15 (permalink) Old 08-27-2011, 03:44 PM Thread Starter
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Yea, I'm weighing the option of upgrading to 13" floating rotor with 6 piston Hawg Halters. A lot of money but that would most likely be the long term solution.

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post #4 of 15 (permalink) Old 08-28-2011, 09:46 AM
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It doesn't take much run out for you to get a pulsation in the brakes. The best way to fix it is to just get a new rotor, the rotors can be turned but it is not really worth the time or money.


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post #5 of 15 (permalink) Old 08-28-2011, 10:20 AM
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If your going to run a single rotor you need to upgrade to a larger diameter disc and caliper or go back to the duals. A RG is too much bike for a single stock sized disc up front. Even if you replace it, one hard stop with it hot is going to warp it again.
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post #6 of 15 (permalink) Old 08-28-2011, 01:04 PM
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I believe the spec on replacement from HD is .008. I had one at .007, and the other at .003, it pulsed in a big way. I bitched till they switched them out. Running a single rotor set up I would thnk your getting a big pulse. Personally I would pull the trigger on a new roter, and change it out.

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post #7 of 15 (permalink) Old 08-28-2011, 04:35 PM Thread Starter
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Thanks guys for the input. I'm probably going to get a new rotor this week.
Z

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post #8 of 15 (permalink) Old 08-28-2011, 05:23 PM
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Make it a floater. Can't go wrong, even a little warp will pulse without a floater.
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post #9 of 15 (permalink) Old 08-30-2011, 07:13 PM
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Rotor replacement

My 2011 RGU has been pulsing for awhile 14,300 miles today.HD dealer said brakes are not covered under warrenty.I went to the sales manager later a complained about the service advisors comment.Mechanic rode my bike in the parking lot and agreed with me on warped rotors.They were changed this morning.Bike is braking smooth now.
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post #10 of 15 (permalink) Old 08-30-2011, 08:09 PM Thread Starter
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Well, you guys are going to think that I'm a real McGiver, very cheap, crazy, Or all three.

I removed the caliper so I could get an accurate reading with the indicator. I found the warp to be in one spot. I slightly loosened the corresponding rotor bolt and the warp suddenly drop to .002" runout from .007". Made a small .002" shim, slid it between the hub and rotor at that bolt, tightened everything up and checked it again; .002" runout.

Went on a test ride, no pulsation!

Yea!

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