Front Brake Squeal - Wrist Twisters
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post #1 of 19 Old 04-09-2017, 08:29 PM Thread Starter
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Front Brake Squeal

I have tried cleaning the rotors, scuffing the rotors, scuffing the pads, still get the squeal. I am running OEM. Thoughts?

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post #2 of 19 Old 04-09-2017, 08:30 PM
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Quote:
Originally Posted by bartsitarski View Post
I have tried cleaning the rotors, scuffing the rotors, scuffing the pads, still get the squeal. I am running OEM. Thoughts?


When does the noise happen...at low speed - or high speed?


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post #3 of 19 Old 04-09-2017, 08:34 PM
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Try adding copper anti seize where the brake pads rest on the caliper. Or any metal to metal contact. I also grease the slide pins with sil glyde. I also lube the back of the pads and clean the pistons.

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post #4 of 19 Old 04-09-2017, 08:38 PM
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How many kms on the bike? are they the original rotors?
I had a bad case of front rotor squeel and I had to change my rotors and pads. Silent as a mouse since then.

My rotors were original and had 50k+ on them. And while they still were in spec thickness wise I still couldn't solve the issue, so I changed them.
Not sure what's the frequency of rotor change but they should still be changed after a while, even if they're in spec.

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post #5 of 19 Old 04-09-2017, 08:40 PM
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I put grease on the rotors

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post #6 of 19 Old 04-09-2017, 08:42 PM
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Same, i also lube my tire for longer life.
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Just ride!
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post #7 of 19 Old 04-09-2017, 11:31 PM
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I have no clue if this would cause noise or not, but someone pointed out that the rotor actually float on rivets. The hollow plugs between where the pads hit and the rotor connects to the rim.

These are supposed to move and they usually don't. Someone posted a video where he put sprayed some brake cleaner in there and spun them with a bolt/nut combo.



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post #8 of 19 Old 04-10-2017, 03:38 AM
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Thanks for posting that video KarlJay. I'll confess that I didn't know those rivets are free spinning. I have cleaned them a hundred times. I went out and checked the ones on my bikes rotors and they are all "stuck". Looks like a job for the weekend.

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post #9 of 19 Old 04-10-2017, 07:56 AM
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Quote:
Originally Posted by Islandboy View Post
Thanks for posting that video KarlJay. I'll confess that I didn't know those rivets are free spinning. I have cleaned them a hundred times. I went out and checked the ones on my bikes rotors and they are all "stuck". Looks like a job for the weekend.
The ones on a 919 aren't fully floating, and you likely won't be able to spin them with just your fingers whether they're clean or dirty. Cleaning them isn't a bad idea to try though.

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post #10 of 19 Old 04-10-2017, 08:49 AM
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One thing I'd be concerned about is that if they are soft metal and you use a lot of torque, you could screw those things up pretty easily. It reminds me that I really need to do a full clean up on my bike. I just did and oil change and it's really dirty down there. I tend to overlook those things.

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post #11 of 19 Old 04-10-2017, 09:49 AM
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OEM brake pads too or are you running some crapass EBC type pads?
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post #12 of 19 Old 04-10-2017, 06:46 PM Thread Starter
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Thanks for the input guys. I greased the pins when doing the brakes a couple months ago. Also put stuff on the back of the pads. @LDH, yes, they are OEM from the dealer. I like the Honda pads. They are great for my riding needs. The squealing happens at low speed, when coming to a stop. I would say the last 10-15mph with light brake application. The rotors are original (I assume) and the bike has roughly 36k miles. They seem true as there were no uneven wear spots, no pulsating either. And I took a micrometer to them when redoing the brakes and they are within spec.

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post #13 of 19 Old 04-10-2017, 09:05 PM
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Quote:
Originally Posted by bartsitarski View Post
Thanks for the input guys. I greased the pins when doing the brakes a couple months ago. Also put stuff on the back of the pads. @LDH, yes, they are OEM from the dealer. I like the Honda pads. They are great for my riding needs. The squealing happens at low speed, when coming to a stop. I would say the last 10-15mph with light brake application. The rotors are original (I assume) and the bike has roughly 36k miles. They seem true as there were no uneven wear spots, no pulsating either. And I took a micrometer to them when redoing the brakes and they are within spec.


I know this is going to sound odd but check your fork tubes. I chased a similar issue for the first two years that I owned my 919. I replaced pads, rebuilt calipers, replaced rotors, etc. only to find out that one of my fork tubes was bent. Since I replaced the fork tube the issue has gone away. Good luck!


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post #14 of 19 Old 04-11-2017, 03:59 PM Thread Starter
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Quote:
Originally Posted by txducman View Post
I know this is going to sound odd but check your fork tubes. I chased a similar issue for the first two years that I owned my 919. I replaced pads, rebuilt calipers, replaced rotors, etc. only to find out that one of my fork tubes was bent. Since I replaced the fork tube the issue has gone away. Good luck!


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That actually doesn't sound odd. But, I also replaced the forks at the same time and the issue was occurring with the old pads and forks, and calipers. Only old item is rotor. I'll start there. That seems to be logical. I'll run a scotch rite pad and clean the floater ring things as best I can. Maybe I'll live with it. Still stops fine, just annoying.


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post #15 of 19 Old 08-14-2017, 04:19 PM
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Any luck on your front brake squeal? I have the same issues. Thanks your help would be appreciated.


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post #16 of 19 Old 08-14-2017, 04:47 PM Thread Starter
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Quote:
Originally Posted by bigm80 View Post
Any luck on your front brake squeal? I have the same issues. Thanks your help would be appreciated.


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No. But truth be told, haven't really taken a deep dive except for a good cleaning. When I do the wheel swap I will make sure to clean the floating lugs on the new rotors.


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post #17 of 19 Old 08-14-2017, 06:29 PM
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I have a slight rear brake squeal. Also only during slow speeds in the last 10 mph or so when stopping. Haven't looked into it at all. I rarely use the rear brake anyway so it doesn't bother me much.


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post #18 of 19 Old 08-15-2017, 11:12 AM
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Found this. Some talk about brake squeal.
Most brake pads use some sort of shim or spring to stop the pad from oscillating,aka making noise. What generally causes the noise is a small amount of movement by the pad at a very high frequency. Manufacturers eliminate this with shims,springs or a soft material that acts as a dampener. It is possible that one of these has failed from time,use or enviromental exposure. Another possibility is the pads are contaminated with crap splashed up from the road. Or crap from bike. Also the pad material is a blend or compounds that offer different traits in terms of wear,stopping power,noise etc. You may have a pad in which the material was not blended evenly and you are encountering hard spots that is causing the squeal. I think pads can be removed and cleaned somehow?
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post #19 of 19 Old 08-16-2017, 12:15 PM
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Quote:
Originally Posted by Islandboy View Post
Found this. Some talk about brake squeal.
Most brake pads use some sort of shim or spring to stop the pad from oscillating,aka making noise. What generally causes the noise is a small amount of movement by the pad at a very high frequency. Manufacturers eliminate this with shims,springs or a soft material that acts as a dampener. It is possible that one of these has failed from time,use or enviromental exposure. Another possibility is the pads are contaminated with crap splashed up from the road. Or crap from bike. Also the pad material is a blend or compounds that offer different traits in terms of wear,stopping power,noise etc. You may have a pad in which the material was not blended evenly and you are encountering hard spots that is causing the squeal. I think pads can be removed and cleaned somehow?
Some really good points above.
Further to them is the following.

My original 05 front pads had thermo insulated shims.
The shims also cut down on heat migration into the piston in an effort to reduce heat input into the brake fluid.
The thermo sheet was there for added effect re heat migration.

Also, for those viewing the floater buttons cleaning trick(s), keep in mind that not all rotors use round buttons.
There is at least one aftermarket manufacturer (EBC) that uses non-round buttons on at least some of their rotor designs.
Attempt to rotate one of those and you will destroy it.

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