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Help with rear brake noise when moving backwards

Old 04-20-2016, 03:34 PM
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Help with rear brake noise when moving backwards

See video...


James
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Old 04-20-2016, 04:05 PM
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My VFR800 makes practically the same noise, which is just a resonance through the pads going in the opposite to normal direction. Unless you're planning on a stunting career with a lot of backwards riding, I wouldn't worry about it. Does the brake feel normal when you use it?
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Old 04-20-2016, 04:19 PM
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Yah the brake is fine, just an annoying noise.

A friend told me to add more lube behind the pads... I considered filing a slight taper onto the leading edge of the pads...

Just annoying when backing up in parking lots

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Old 04-20-2016, 05:33 PM
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Well take off, eh.
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Sounds like a bad Charlie Brown episode when the teacher talks to him.
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Old 04-20-2016, 06:41 PM
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Fire the trumpet player. He sucks. Problem solved.

I'm assuming the pad isn't worn at the back more then the front.

Last edited by Meier Link; 04-20-2016 at 06:43 PM.
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Old 04-20-2016, 08:36 PM
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The pads shouldn't be worn at all... I installed them last year and haven't used them since...

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Old 04-20-2016, 09:07 PM
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Just throw some grease on there.
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Old 04-20-2016, 09:10 PM
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My friend mentioned that, that the pads are resonating in the caliper. He mentioned he installs disc brake quiet gel for pads, then lets it setup for 15 minutes so the gel doesn't get scraped off during installation/use. He said the stuff he uses sets up and turns into a rubbery material...

Anyway, i'm thinking about trying that...

James
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Old 04-20-2016, 09:10 PM
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I had that happen once and the pads and rotor surface were glazed. I was able to fix it with some 200 grit sandpaper to the pads and rotor. It was an old bike, so I didn't care if it hurt the parts, but it worked.
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Old 04-21-2016, 07:32 AM
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Originally Posted by CruxGNZ View Post
I had that happen once and the pads and rotor surface were glazed. I was able to fix it with some 200 grit sandpaper to the pads and rotor. It was an old bike, so I didn't care if it hurt the parts, but it worked.
That's kinda like the resonance you create when you move the finger on a glass of wine

You can use more fine sand paper and apply it lightly with even pressure on the surfaces, but generally that would fix it.
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Old 04-21-2016, 09:15 AM
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So the fix for this is to chamfer the pads in the direction of the issue. Meaning the leading edge while going backward. Remove the pads and sand them with like 110 grit paper at a 45* angle. You are trying to make a beveled edge as the rotor slides onto the pads.

Many pads come with this design. You can even just carefully use concrete to do this. Once you chamfer them this issue will stop.

Doesn't have to be this dramatic. Any bit of this type of angle will work.
Attached Thumbnails Help with rear brake noise when moving backwards-m-b06-1-1.jpg  
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Old 04-21-2016, 09:25 AM
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I said to the doctor, 'It hurts when I do this' [raises arm]. He said, 'Well, don't do it.'
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Old 04-21-2016, 09:51 AM
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I should not have watched that with headphones and loud volume.. hahaha that was unexpected
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Old 04-21-2016, 09:54 AM
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Originally Posted by thedeatons View Post
My friend mentioned that, that the pads are resonating in the caliper. He mentioned he installs disc brake quiet gel for pads, then lets it setup for 15 minutes so the gel doesn't get scraped off during installation/use. He said the stuff he uses sets up and turns into a rubbery material...

Anyway, i'm thinking about trying that...

James
Advance Auto has a spray can for the back of brake pads. Works great on automotive brake pads. I haven't had to use it on motorcycle pads yet.

I would chamfer the pads like Smokin' mentions and then put that spray or gel on the back of the pad.

Supprised Steve hasn't yet made a comment about you going backwards with a motorcycle
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Old 04-21-2016, 10:34 AM
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Well, not everyone can spin the rear wheel and do a 180 out of a parking space like me. All on just the rear tire, of course.
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Old 04-21-2016, 10:38 AM
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I am not a fan of adding gook of any kind anywhere mechanical that I don't need to. Brakes being top of the list.

Just makes it more likely it will get onto friction surface or rotor. Have seen it happen.
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Old 04-21-2016, 12:47 PM
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That spray is intended for the back of the pad. It dries and doesn't stay a "gook".

Some manufacturers of brake pads are including backing plates with that anti-squeal stuff already applied.

Last edited by CruxGNZ; 04-21-2016 at 12:51 PM.
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Old 04-21-2016, 04:54 PM
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A friend of mine recommended this. Not a spray.

He lets it set up for 15 minutes which makes it jelly-like.

James
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Old 04-21-2016, 05:53 PM
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Originally Posted by thedeatons View Post
A friend of mine recommended this. Not a spray.

He lets it set up for 15 minutes which makes it jelly-like.

James
I have used that on car disk brake pads for many years, it works well.
On your issue.....
Honestly I think the pistons are not retracting as designed, likely old hard seals.
If you're positive its not that, then the taper on the rear edge (leading edge in reverse) should fix the issue.
I have never needed pad adhesive on a bike to tame pad noise
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Old 04-21-2016, 05:56 PM
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New seals... Brakes operates great... I do notice the fluid is all the way up to the plug on my reservoir delete hose.... I think i topped it off during the cold winter, now it is 80 out... Hmmm... Likely a mistake.

I don't recall whether it was making the noise before topping off the fluid...

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Old 04-23-2016, 05:02 PM
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Fixed! Well... For now.

Went out early this morning and rechecked it cold... No noise... Hmm...

Well, I took it apart anyway. Chamfered the rear pads front and back, deglazed them, then started the bike and hit the rotor with 320 while it was spinning, then cleaned everything off.

Also cleaned the pad backing plates and reapplied Permatex disc brake quiet, amd let it setup until it dried (about 15-20 min).

Reinstalled everything.

Oh and I also pulled all the brake pad pins, sanded and regreased them.

Will probably let a little fluid out of the rear reservoir also since it is all the way full... May not be letting the piston retract fully...

James
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