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-   -   Re-surface brake rotors? (http://www.advrider.com/forums/showthread.php?t=840923)

waddyp 11-12-2012 06:19 PM

Re-surface brake rotors?
 
At 50k miles on my '07 12GS, my front rotors are showing wear. Does anyone know: can they be 'turned' (re-surfaced)?

07wee 11-12-2012 06:23 PM

Its possible, but I've never been able to find a shop willing to do it around me.

Idle 11-12-2012 07:14 PM

I'm prolly gonna die.

I resurfaced my front rotor while on the bike. I have a variable speed grinder and 4" diamond polishing pads.
I only did the outside but plan on flipping it around to do the same to the inside in the next couple of days.

I had a slight lip on the outside of my disc. I have since shimmed the caliper out so I felt I had to get the lip ground down to get 100% contact.

Fwiw, I used a little water on the 300 grit diamond pad and it was a 310mm disc well in spec.

def 11-12-2012 07:16 PM

Quote:

Originally Posted by waddyp (Post 20030834)
At 50k miles on my '07 12GS, my front rotors are showing wear. Does anyone know: can they be 'turned' (re-surfaced)?

Resurface? No.

But, what do you mean, "showing wear"?

Rotors do show signs of friction from the pads.

You'll need to determine rotor thickness and when out of spec, replace the rotors...kind of like tires.

GS Addict 11-12-2012 07:42 PM

Considering that the wear tolerance is .5 mm I don't see where the material is going to come from for a fresh surface on each side.
These are not automobile rotors.

Juvat 11-12-2012 07:52 PM

^^^^ What he said.:deal If you try to shave those (and it is a shave) you could end up in a world of hurt. I'd just mic them to ensure the dimensions are still serviceable, through some new pads on and go!

Juvat 11-12-2012 07:55 PM

Note: I did see somebody throw their disks on an auto lapping table and they came out pretty good. Not worth doing if you don't have ready access to one though, and it is total overkill. My buddy just did it for fun.

billdonna 11-13-2012 03:31 AM

Absolutely it can be done. As a tool & die maker I had lots of people bring me old bike and car parts to try and salvage them because SPARES WERE NOT AVAILABLE!

One could set up the disc on an internal cylindrical grinder and remachine the faces with a cup wheel. Nice cross hatch pattern and good control over the amount of stock removal. Any other method can create disc wobble.

Should it be done? Naw...too easy to warp them or go under the min thickness trying too clean them up. Best to pony up the cash for new ones.

Disco Dean 11-13-2012 05:57 AM

Like he and he and he said... too thin to begin with and not worth the risk...

There is a nice little Brembo logo on the disk that is stamped into the disk - if it has been worn clean/smooth the disk are done - at least in my measurements it has worked out perfectly that way.

D.

def 11-13-2012 07:08 AM

Quote:

Originally Posted by GS Addict (Post 20031456)
Considering that the wear tolerance is .5 mm I don't see where the material is going to come from for a fresh surface on each side.
These are not automobile rotors.

:thumb

If you insist on tinkering with motorcycle brake rotors, some sandpaper is allowed but, I would use caution....you're messing with the most important system on your motorcycle that may save your life one day.

def 11-13-2012 07:09 AM

Quote:

Originally Posted by Disco Dean (Post 20033105)

There is a nice little Brembo logo on the disk that is stamped into the disk - if it has been worn clean/smooth the disk are done - at least in my measurements it has worked out perfectly that way.

D.

Where? I've never seen it. Photo?

Disco Dean 11-13-2012 12:32 PM

Quote:

Originally Posted by def (Post 20033511)
Where? I've never seen it. Photo?

I'll post a photo later as I dropped off the wheel to get a new tire on and haven't picked it up yet. Damn Heidenau's are so friggin stiff... spoon those babies on...

It is the Circular Brembo "b" logo and it sits half on the wear surface and half off on the inside of the disk. I have had other Brembo disks that have a similar placement.

My bike is a 2006 R1200gs if it matters.

I cannot confirm from Brembo that it is in fact a wear indicator - however it works to the specs perfectly - is situated to wear out with use and wears only half way to let you see that it is still there when the disks are worn out. As soon as I cannot make out the stamp - the disk mics out to the spec.

If it is not - it is a coincidence that it works. Either way I mic the disk to be sure but it is a good visual indicator as to when I should check.

def 11-13-2012 12:46 PM

I have not observed it on my 2001 Brembo equipped GS. However, that doesn't mean that it is not there.

lkchris 11-13-2012 01:02 PM

Taking the lip off is pretty funny. This is the place the pads never contact.

ragtoplvr 11-13-2012 02:29 PM

grooves are just more surface area.

if not warped and you do not race, use it.

Rod


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