EBC Rotors and tolerances

Steve Northrop blackgpz at rochester.rr.com
Wed Mar 12 17:09:57 PDT 2008

The sharp edged holes are not a factor. The pulsing is typically caused by 
an uneven deposit of the brake pad material on the rotor. This may even be 
the variance you are measuring. I probably wouldn't have used an orbital 
sander on something I wanted to be really flat. I prep my rotors with 180 
grit emery cloth over a piece of ground A2 stock. I also de-glaze the new 
(or old) pad surfaces as well. Remember to degrease everything too. This 
assures full, clean contact when bedding in the brakes. You'll have to sand 
the rotor again to remove the pad deposits and start over. It won't just go 
away. Good luck.

Steve in Western NY
'96 GPZ1100
'02 Daytona 955i
'08 KLR 650
"You Can't Fix Stupid", Ron White

----- Original Message ----- 
From: "Steven Bixby" <steven at bixbys.net>
To: "Kawasaki GPZ1100 discussion" <gpzlist at micapeak.com>
Sent: Wednesday, March 12, 2008 5:55 PM
Subject: Re: EBC Rotors and tolerances

> I'm pretty sure the (new, Galfer) pads are in straight and correctly,
> although it's very hard to verify this without removing the caliper
> (after removing the RH muffler).   I've put them in cockeyed once
> before and the most noticable trait is a spongy pedal since it's
> clamping unevenly and flexing the slider pins..
> The other thing I noticed with these rotors is the very-sharp edges in
> the holes; I seem to recall the old rotor had slightly chamfered
> holes, but this thing's drilled holes are sharp-edged.  Anyone think
> that's a factor?
> On 3/12/08, scapco at ecentral.com <scapco at ecentral.com> wrote:
>> Steve,
>> That really does sound like a bad rotor.  One thing to
>> check, how are the pads looking and are they installed
>> straight?  The amount of variance doesn't sound that bad,
>> but it's either the rotor or somehting ins't on straight.
>> Charles S.
>> >
>> >However, I'm not sure if that's within normal tolerances
>> >for a rotor, does anyone know?   I'm sure it's not given
>> >the amount of pulsing the brake does.
>> >
>> >Whaddya all know? 

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