EBC Brake Discs

AndyW said:
Hey Cam,
If they're only out by .1mm couldn't you simply have them true'd up by skimming them?

Just a thought..
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I tried that once on some cast iron discs on the lathe!
The fecking surface is as hard as diamond, not a pretty sight I'm afraid.
I can image that people grind the surface to reclaim it or something like that.
 
I'll find out Monday. Taking the rotors to Perth Brake Parts as they reckon they can skim them. Only hope the is enough thickness left once they are back to smooth. They can also rebuil my calipers after I fucked to sets of seals trying to insert the new pistons - not fucking happy Jan. And they can sort out the caliper with the bleed nipple threads that appear to be 6.5mm. It just goes on and f'n on.
 
France Equipment will also make the unslotted versions for the Laverdas. I gave them an original to make copies from a few years back. No idea why they're not listed but they do exist. They work great, you can use a much wider range of pads, and no more rust when they get wet.

Tom
 
AndyW said:
Hey Cam,
If they're only out by .1mm couldn't you simply have them true'd up by skimming them?
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Theoretically possible, but the local brake and clutch places I've asked about it say they don't do motorcycle disks. Something about them not fitting in their surface grinding machines.

I could probably send them to a specialist motorcycle brake rotor place somewhere.

Cam
 
Davo said:
Got a real downer on him since you got booted off his forum, eh?
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You're right but I didn't get booted in the end, just a couple of warnings. They've called for the defibrillators but it's too late. I looked last week and I think the Bevel Heaven forum had had three of four posts since Christmas. There's a big difference between passion, milking it and flogging a dead horse.


 
give graham blake a call at browns plains brisbane-07 3200 0644
hes a disc grinder and is reasonably priced-way cheaper than newy,s
 
Fred Howie did my 3c discs way back when, he'd never done a Brembo cast iron disc before and was amazed at how hard they were, chewed up a complete grinding wheel. But I'm pretty sure he's retired now.

Ken
 
bevelman said:
give graham blake a call at browns plains brisbane-07 3200 0644
hes a disc grinder and is reasonably priced-way cheaper than newy,s
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Thanks for the contact Paul. I gave him a call. He can do them. He seems like a nice bloke. A lot more helpful than the local brake and clutch people who don't want anything to do with bike brakes. He told me to send him the disks still on the carriers because he spins them up and checks everything for alignment. He will true up both faces of the disk for $95 per disk and send them back the next day by express post. Sounds like a good service and the cheapest option yet. I reckon I'll give him a go.

He also said he can manufacture new disks from scratch. Could be useful if you're looking for an unusual fitment.

Cheers,
Cam

 
FFF!!!

Just back from the brake guys, yes my rotors can be ground and resurfaced but, and it is a FFF BUT, they will take 1mm off the width of the rotors to do it which will take them below minimum thickness.

So, 3 new SS drilled rotors ordered from Metalgear.

1 step forward and 2 steps back.
 
Sent my brake rotors off to Graham Blake to be re-ground. He shouldn't need to take any more than about 0.1 mm off each side to get them straight, so don't expect to lose much thickness.  I'll let you guys know how they turn out.

Cam
 
No, mainly because I don't know what the minimum is. He said he's done heaps of Brembo cast iron disks off old Italian bikes, so he sounds like he knows what he's doing. He actually knew what a Laverda was, and the various types of rotors they had on different models, which impressed me.

 
I got my disks back from Graham Blake. Very quick turn around of 7 days from when I un-bolted them until I bolted them back on. Not bad considering they had to go from Tassie to Queensland and back, and would have spent a few days in the mail system.

The grinding job looks very nice. Good smooth surface with just a hint of cross-hatching from the grinder. Disks still thicker than the minimum allowable so he only took a bee's dick of thickness off them.

I took the bike for a test ride this morning and braking is now as smooth as ... er ... (insert smooth analogy here). It's way better than the lumpy, jerky braking action I had before.

I phoned up Graham to tell him how pleased I am, and he asked me to write him a testimonial, which I will certainly do. He's a bit old school and doesn't have a website or even email, so the testimonial will have to be on paper. I'm not sure how he's going to promote his business without electronic media, but that's his concern.

He grinds the disks on their carriers as an assembly. First he trues up the face of the carrier where it bolts to the wheel, then grinds each face of the disk to exactly align with the carrier, so 6 grinding operations for two disks. He charged $190 for the job. Money well spent as far as I'm concerned.

He explained that he uses a process he calls freeze feather grinding, in which he uses copious amounts of iced water as a coolant to keep the disk at a constant 0 degrees while grinding. He reckons it eliminates any local heat distortion from the grinding process and therefore doesn't induce any residual stresses. I put the dial gauge on the disk when I fitted it up to the wheel, and there's no axial run-out at all. I'm not sure what the "feather" bit refers to, maybe the hatching pattern on the finished surface.

Anyway, if you have original cast-iron disks that are less than perfectly smooth or even slightly mis-aligned, I recommend giving Graham a call on 07 3200 0644. He doesn't always answer the phone because he may be operating a machine. If that's the case, just try again later. He doesn't have voicemail. 

Cheers,
Cam
 

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