EBC Brake Discs

Do you know the measurement of yours, Reggie?
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Probably shorter than average...  :o  Oh, sorry, you mean the discs!  No, the bike was sold some time ago.  They would have definitely been thinner than the Brembos though!
 
BH sell the discs as a bare set, just troll thru the brakes section.

Their kits fit straight onto an RGS/CORSA and probably work out cheaper than getting the worn out carriers and discs machined and new oversize bobbins fitted.
I bought mine for the CORSA before I found out Red was able to do the machining and had a supply of over size bobbins.  Not sure if he still does tho.
 
Both my original 3CL front disk rotors have a slight warp. Being solidly bolted to the carriers, they generate pulsing action in the front end under even moderate braking. Heavy braking from high speeds is like riding a jackhammer. So at the very minimum, I need new rotors. But while I'm at it, I'm thinking about an upgrade to better brakes, so this thread is very informative.

I'm trying to decide whether to go with the 300mm Brembo floating disk upgrade with the P30/34 calipers, or the cheaper option of the 280mm EBC floating disks and keep my old F08 calipers, which work OK.

I'd prefer to retain my old master cylinder for the period look and to save a few bucks, also because I have a couple of rebuild kits lurking on the shelf. Doing some arithmetic, the total slave piston area of two F08 calipers is 45 cm2, whereas the P30/34 is 65 cm2. So swapping to the twin piston calipers and retaining the original master cylinder will give greater clamping force at the pads, but might run out of lever travel at the handlebar.

Is anyone running P30/34 calipers with the early type master cylinder? If so, does it work OK?

Cheers,
Cam


 
Cam, have you checked for corrosion between carrier and disc and carrier and hub?
A little goes a long way.
 
I have had this. Especially bad if the DPO painted the wheels or carriers.
 
OK, I took Grant's advice and checked for corrosion or other crap between the mating surfaces. They were quite clean so the problem wasn't there. Next step was to get the dial gauge out and check everything for axial run-out. The disks both had about 0.25mm run-out at the outer diameter of the swept area. This decreased with decreasing diameter. At the diameter where the disk bolts to the carrier it was about 0.15mm, which actually turned out to be a warp in both of the carriers. The wheels themselves were nice and true at the hubs where the carriers bolt on.

So, off with the disks, set 'em up in the lathe so the disks ran true - well as true as I could get them, there was actually a bit of a warp in each disk too. Then skim the inside surface of the carriers where they bolt to the hub. Only had to take a gnat's foreskin thickness of metal off so any change to disk offset is negligible.

The carriers are now running true, but the disks still have a bit of run-out as mentioned above (less than 0.1mm at the outer diameter of each disk) but that's down to warping in the cast iron rotors themselves. Not much I can do about that. I don't have the facility to surface grind them at home.

Anyway, the brakes feel a whole lot better on a brief test ride around my neighbourhood. I haven't tried heavy braking at high speed yet, but hopefully it'll go a long way to eliminating the the fork shudder.

Cheers,
Cam 

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Cam.

There has been a bit of discussion in the past on the subject of original Master Cylinder with bigger calipers.
I was looking for some info when I put P09's onto my bike, and the group were fairly divided, with successes and failures from different members.
The string was 12 or 18 months ago.

I had hoped that the original master would give me more feel but, whilst I got sufficient stopping power, I couldn't live with the lever feeling soft and pulling pretty much fully into the handlebar.
So, I am about to fit a bigger Master, and still haven't decided whether to stay with the P09's or change to some 4 pots.
 
Hmm ... OK, went for a longer ride today. Straightening up the disk carriers has improved things, but braking is still not as smooth as I'd like it to be. The cast iron rotors are both quite straight for about 3/4 of their rotation, but the other 1/4 has a warp with an axial displacement of around 0.1mm. I wonder what could have caused the same warp in both of the disks. Maybe heat or a crash? I forgot to check whether both disks were warped at the same place on the wheel before I took them off.

Anyway, now I know that the carriers are running true, a pair of bolt-on metalgear disks might be the answer. Anyone tried them?

Cheers,
Cam
 
Dale said:
I am also starting to get a bit confused about the offset I need.
These discs are marketed with 26mm, 27mm and 28mm offsets, and all claim to fit the same bikes!
Anyone know the correct item?
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Just measured one of my freshly cleaned and anodised carriers from my 76 3CL. Offset from mounting surface of carrier (carrier to wheel hub) to outer face of rotor is 27mm.

Oh, and Bevelheaven has Brembo replacement rotors 300mm floaters with 26.5mm offset on 80mm x 6 hole centre carriers at USD $350 ea https://store.bevelheaven.com/brake-related-parts/brake-rotor-750f1-s2-late-900ss-bevel-darmah-etc-300mm-made-by-brembo/
 
Hey Cam.
Yea put a set of metal gear stainless discs on mine which has Jota carriers. No complaints so far except they squeal a bit at very low speed (pads maybe?) . Stop just as good if not better than original. Happy so far. 
 
silvo said:
Hi Cam,

All I've heard is that Metalgear discs only work with Metalgear pads. For a master cylinder I'd go looking for one of these. Not cheap but very good combo with O8 Brembos. Steve B. uses one on his bike I think.

Cheers
Chris
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Wrong, copied from an earlier thread on rotors:-

motoddrob said:
I called Metalgear, as for the pads, you need to use Metalgear pads only for warranty reasons, otherwise all pads will work. I need to buy new pads anyway so may as well go with their pads first up.
Still waiting to hear back from S3 wether they have disc to suit the early GSXR
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Davo said:
Oh, and Bevelheaven has Brembo replacement rotors 300mm floaters with 26.5mm offset on 80mm x 6 hole centre carriers at USD $350 ea https://store.bevelheaven.com/brake-related-parts/brake-rotor-750f1-s2-late-900ss-bevel-darmah-etc-300mm-made-by-brembo/
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Which means that you can buy them somewhere else for half the price he sells them for. Bevelheaven isn't in business to sell to poor Laverda owners. Who's this French rotor mob SF Piet was talking about the other day?

Good to know that you can use any pad with the Metalgear discs.
 
Thanks for the feedback guys. I reckon I'll go for the cheapo option of a pair of Metalgear disks and retain the existing hydraulics. The Brembo 300mm floaters and 4 piston calipers would be nice, but the F08 calipers work well enough for normal road use. They're capable of squealing the front tyre and that's about as hard as I ever want to brake!

I've sent them an email to ask about warranty conditions re pads.

Cheers,
Cam
 
silvo said:
Which means that you can buy them somewhere else for half the price he sells them for. Bevelheaven isn't in business to sell to poor Laverda owners. Who's this French rotor mob SF Piet was talking about the other day?

Good to know that you can use any pad with the Metalgear discs.
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Got a real downer on him since you got booted off his forum, eh?
 
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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