Brake rotor friction

Randy Grein randygrein at
Thu Aug 9 20:15:36 PDT 2007


I'm off to a track day tomorrow - pray to the god of friction  
inhibitors the engine does OK. I'll be happy if I can get down to my  
supersport times with the additional power - it's all chassis and  
suspension tuning tomorrow.

Randy Grein, WMRRA #41

On Aug 9, 2007, at 1:08 PM, Erik Weber wrote:

> Yep.
> Well, I got the bike straightened after one crash, and it was perfect.
> Then I promptly went out and crashed it again. Can't afford it every
> time!
> Erik
> On 8/9/07, randygrein at <randygrein at> wrote:
>> Wow! So we were on the right track, just hadn't thought of bent  
>> parts. (grin)
>> You may want to get the part(s) straightened...
>> Randy Grein, WMRRA #41
>>  -------------- Original message ----------------------
>> From: "Erik Weber" <yoober at>
>>> Randy, I had my bike in the shop yesterday and someone much smarter
>>> than me figured out the problem.
>>> My front wheel was basically whacked out of alignment and was being
>>> pushed over to the side by either a slightly bent fork or maybe bent
>>> triple clamps. Also the wheel bearings were slightly pushed out  
>>> making
>>> the problem worse.
>>> What was happening was that my caliper itself, not the pads, was
>>> rubbing on the rotor on one side! It could have developed into a
>>> dangerous situation, as the caliper studs that poke out and were
>>> scraping were coming perilously close to the grooves in the rotor.
>>> Getting the wheel closer to straight has evened out the caliper
>>> clearances. The pads still scrape a little but it's a world of
>>> difference now.
>>> Thanks,
>>> Erik
>>> On 6/24/07, Randy Grein <randygrein at> wrote:
>>>> Eric,
>>>> I've had a lot of variance when changing wheels. What seems to help
>>>> is to put the bike back on the stands, loosen the caliper bolts and
>>>> tap the brake lever several times while spinning the wheel. Then
>>>> apply the brake lever and hold it while tightening the caliper  
>>>> bolts.
>>>> This seems to get the calipers seated more exactly; may or may not
>>>> help with your noise problem.
>>>> Randy Grein, WMRRA #41
>>>> On Jun 23, 2007, at 6:35 PM, Erik Weber wrote:
>>>>> Well, that makes me feel slightly better. :) But it bothers me  
>>>>> that
>>>>> all I did was take the wheels off and have new tires mounted  
>>>>> and they
>>>>> got worse. I was wondering if something could stop them from  
>>>>> releasing
>>>>> 100%.
>>>>> On 6/23/07, Ernest Montague <afm199 at> wrote:
>>>>>> dunno but they are scrapy ass loud pads for sure.
>>>>>> On Jun 23, 2007, at 4:52 PM, Erik Weber wrote:
>>>>>>> I have a 2001 SV650S. I have the RJLs on the front, and they are
>>>>>>> probably thicker than normal, so I never thought too much  
>>>>>>> about the
>>>>>>> fact that they scrape a little on the rotors and there is some
>>>>>> sound
>>>>>>> there (with no brake lever pressure). Since the bike will  
>>>>>>> still do
>>>>>>> around 130 I figured how much could it matter and it keeps the
>>>>>> rotors
>>>>>>> clean. :) Today I had the wheels off and now after I have put  
>>>>>>> them
>>>>>>> back on, they are scraping a lot more, to the point where  
>>>>>>> when I'm
>>>>>>> coasting someone is going to notice it. I did some laps and it
>>>>>> was OK
>>>>>>> but what is wrong?
>>>>>>> Thanks,
>>>>>>> Erik

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