New Brake pads, now it squeals.
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New Brake pads, now it squeals. Pete 06-23-2007
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Posted by Pete on June 23, 2007, 9:17 pm
Had new rear pads put on my YZF600r. Now it makes a squeal when you are
almost to
a stop. If you push the brake hard it doesn't do it, but with light braking
it does.
Any ideas why this does this and how to remedy it? Thanks.



Posted by Albrecht via MotorcycleKB.com on June 23, 2007, 10:02 pm
Pete wrote:
>Had new rear pads put on my YZF600r. Now it makes a squeal when you are
>almost to
>a stop. If you push the brake hard it doesn't do it, but with light braking
>it does.
>Any ideas why this does this and how to remedy it? Thanks.

Your new pads have probably glazed from lightly contacting the disks as they
turn.

There is a little known ratio of sliding friction to breakaway friction that
riders encounter as they come to a full stop. Sliding friction is 1/3rd of
breakaway friction and, when a rider comes to a complete stop with a handful
of front brake, the retarding force on the front disks suddenly triples as
the disk stops turning. That's when the motorcycle transfers a lot of weight
to the front wheel and does a stoppie.

By the same token, when the rear wheel comes to a full stop with the rider's
hind leg pushing down hard on the brake pedal, there's a lot of retarding
force on the rear disk and the rear brake may lock up slightly.

Sometimes you hear a groaning sound when you use the rear brake to stop.
The groaning comes from the disk overcoming breakaway friction, the pads
slide, then grab, then slide, etc.

If you pop you pads out out and examine them, the surface of an aftermarket
semi-metallic brake pad will look shiny.

To stop semi-metallic pads from squealing just lay a piece of sandpaper on a
sheet of glass and work the pad in a figure 8 motion until the glaze is gone.

You can also clean the dark slick surface off the disk using some brake
cleaner and maybe a Scotch Brite pad. If you jack the rear wheel off the
ground and hold the pad against the disk while you rotate the wheel, you
won't get any strange swirly patterns on the disk.

Organic original equipment pads may look shiny all the time, you can knock
any glazing off the surface by hard application of the rear brake.

Don't go out and jam on the rear brakes an lock them up and fall down just
because I said that.

--
Message posted via MotorcycleKB.com
http://www.motorcyclekb.com/Uwe/Forums.aspx/yamaha/200706/1


Posted by Pete on June 24, 2007, 9:56 am

> Pete wrote:
>>Had new rear pads put on my YZF600r. Now it makes a squeal when you are
>>almost to
>>a stop. If you push the brake hard it doesn't do it, but with light
>>braking
>>it does.
>>Any ideas why this does this and how to remedy it? Thanks.
>
> Your new pads have probably glazed from lightly contacting the disks as
> they
> turn.
>
> There is a little known ratio of sliding friction to breakaway friction
> that
> riders encounter as they come to a full stop. Sliding friction is 1/3rd of
> breakaway friction and, when a rider comes to a complete stop with a
> handful
> of front brake, the retarding force on the front disks suddenly triples as
> the disk stops turning. That's when the motorcycle transfers a lot of
> weight
> to the front wheel and does a stoppie.
>
> By the same token, when the rear wheel comes to a full stop with the
> rider's
> hind leg pushing down hard on the brake pedal, there's a lot of retarding
> force on the rear disk and the rear brake may lock up slightly.
>
> Sometimes you hear a groaning sound when you use the rear brake to stop.
> The groaning comes from the disk overcoming breakaway friction, the pads
> slide, then grab, then slide, etc.
>
> If you pop you pads out out and examine them, the surface of an
> aftermarket
> semi-metallic brake pad will look shiny.
>
> To stop semi-metallic pads from squealing just lay a piece of sandpaper on
> a
> sheet of glass and work the pad in a figure 8 motion until the glaze is
> gone.
>
> You can also clean the dark slick surface off the disk using some brake
> cleaner and maybe a Scotch Brite pad. If you jack the rear wheel off the
> ground and hold the pad against the disk while you rotate the wheel, you
> won't get any strange swirly patterns on the disk.
>
> Organic original equipment pads may look shiny all the time, you can knock
> any glazing off the surface by hard application of the rear brake.
>
> Don't go out and jam on the rear brakes an lock them up and fall down just
> because I said that.
>
> --
> Message posted via MotorcycleKB.com
> http://www.motorcyclekb.com/Uwe/Forums.aspx/yamaha/200706/1
>

Thanks for the reply. I'll pull them of and look at them today. That high
pitched
squealing noise is driving me nuts.



Posted by on June 24, 2007, 11:19 am

>
>Had new rear pads put on my YZF600r. Now it makes a squeal when you are
>almost to
>a stop. If you push the brake hard it doesn't do it, but with light braking
>it does.
>Any ideas why this does this and how to remedy it? Thanks.
>
>
sounds like the new pad hasn't seated.
go out and do some hard riding and braking to get some even
wear.

Posted by sdz;flkzxc.nm,v on June 25, 2007, 2:02 pm

> Had new rear pads put on my YZF600r. Now it makes a squeal when you are
> almost to
> a stop. If you push the brake hard it doesn't do it, but with light
> braking it does.
> Any ideas why this does this and how to remedy it? Thanks.
>
You could soak the brake pads in silicone oil overnight
Then they won't squeal



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