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Thefleshrocket
Posted on Tuesday, June 27, 2017 - 12:16 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Last week, I changed out the front tire on my 1125R with a new Q3+. I did it myself, and it went off without trouble. I rode it around a bit (like 30-40 miles or so) and didn't have any issues. I then trailered my 1125 to Deals Gap with some friends. At some point early in the trip, I noticed that I was getting a significant pulsation from the front brake. It seems to improve greatly, to the point that it was almost unnoticeable, when I got the front brake warm during some tight sections, but later after it had cooled down, the pulsation would return.

I returned yesterday and pulled the front wheel tonight. Notice the ridge on the inner section of the rotor, as well as the scratch-looking marks around that vicinity.

The pads themselves look mostly fine, except that they are worn down more than usual in the area that would have gone over the ridge.

Not pictured, about 90 degrees away along the brake rotor, I could feel a raised sliver on the rotor in the middle of the ridged section. It's raised above the ridged section, and it feels slightly "sharp". I'm pretty sure it's what's damaged the pads in that region, causing the ridged section on the rotor but.. I don't get how it got there. I don't know how to describe what it feels like, except that it's kind of like what I'd expect metal to feel like if it got a splinter of wood in it. Weird, huh?

Anyway, I am going to sand down the rotor's outside surface and see if that helps. Does anyone know what happened or have any input?
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Thefleshrocket
Posted on Tuesday, June 27, 2017 - 12:26 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)


Front brake rotor 1



Front brake rotor 2



Front brake rotor 3



Front brake rotor 4



Front brake rotor 5
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Stevel
Posted on Tuesday, June 27, 2017 - 03:15 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

It appears if there was trapped debris that became imbedded in the pad. Carefully inspect the pads for debris as well as any raised surface area on the disk's surfaces.
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Thefleshrocket
Posted on Tuesday, June 27, 2017 - 10:24 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Ahh, that makes sense.

Before I reinstalled the wheel, I used a screwdriver to push the pads (and therefore the caliper pistons) back into the caliper--this at least temporarily cures the slack that builds up in the front brake lever over time. I must have chipped off a piece of pad material slightly, and then it affected the rotor.

I guess next time I decide to do that, I'll pull the pads and just push the pistons themselves.

Do you think that going over the rotor with a rotating disc sander will be sufficient to bring it back to health?
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Nuts4mc
Posted on Tuesday, June 27, 2017 - 10:53 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

go here...scroll down for a picture of a "Brake Hone"...

http://www.badweatherbikers.com/buell/messages/290 431/793276.html?1475812537

not cheap...auto zone shows about $60
http://www.autozone.com/test-scan-and-specialty-to ols/brake-and-engine-cylinder-hone/brush-research- coarse-rotor-flex-hone/341314_0_0

HTH
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Terrys1980
Posted on Tuesday, June 27, 2017 - 11:07 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

WD40 and Brillo will get most of off, then throw on a good set of HH pads, make a few high speed stops and it will all go away.

If you still want to buy a rotor hone pm me, I have a unused medium grit to sell.
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Joe7bros
Posted on Tuesday, June 27, 2017 - 07:37 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I wonder what your state inspection requirements are for brake rotors. I think that would fail safety inspection in PA
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Thefleshrocket
Posted on Wednesday, June 28, 2017 - 07:47 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

We don't have any sort of safety inspections in Illinois.

I went over the rotor multiple times with a rotating disc sander (went through about 10 discs) until it was almost completely smooth. The one groove can still be felt running my finger over it, but it's slight.

I went for a test ride but still noticed some pulsation, but not like before. I found a post about the floating part of the rotor not floating properly, so I used a rubber mallet and tapped the rotor by each bolt. That seemed to free it up--as far as I can tell, there is no more pulsation or noise. So, at this point, I'm going to call it fixed.
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