Front Brake Conversion

D

Dale

Senior member
Location
Malta
Rather than continue to hijack the other topics:

I am seriously looking at converting my SF2 to a set of more modern Brembo 4 pot calipers and floating discs.
I have seen a few photo's of this conversion on this forum, and am looking for information.

Discs:
What diameter discs will it end up with?
What model would I need to specify in order to fit the standard Lav alloy wheel bolt pattern?

The mounting bracket:
I see that there are some available commercially, and some home-made.
Any comment on the commercial varieties?
Anyone with plans for the home made variety?

Any other comments from the chaps that have done this conversion would also be appreciated.
Thanks
 
No need for fancy discs- my RGS runs the standard discs and four pots (EBC Carbon/organic pads) and the braking is more than adequate for what is a faster bike of similar weight.
 
Hi Reggie3cl

I didn't think that the new calipers would open wide enough to accept the cast discs.
But if that is the setup you have, then there is a money saving to be had.

The other aspects that I wondered about were:
If the callipers are designed around a larger diameter disc, then they wouldn't match our originals properly.
The weight saving from original, cast discs and new, thinner ones.
 
Hi Dale
Floating discs will vary, from make to make and mfr to mfr, ie an EBC disc for a bike will weigh different to the OE disc or one from China. Different construction, materials and cut aways.

I can tell you the following to give you an idea.
Kawasaki Disc 310 floating, used, ZX9R and hundred other fitments 1.32kg ea
Kawasaki Disc 310 floating, used, ZX9R and hundred other fitments 1.6kg ea
EBC Disc 320 floating, new TRiumph Hinkley 90's                       1.515kg ea


You cannot assume too much unless someone has a tried and tested package and there must be most variations done by now, most floating discs will tend to be a mm or so narrower than the 70's Brembos.
As for  pad positioning, you should be able to get most swept areas onto the right part of the disc, there are Im sure kits available through this forum.
It would be harder to get a 2 pot designed for a small diameter to fit a larger  disc than t'ther way round. Hopefully you'll get more feedback and fit what works for you and your needs...good luck..

ps Ive a feeling, that BMW (late 80's ?) 4 pot calipers are a direct bolt on replacement for the original Marzo forked type but that might be part of teh truth..

Rob
 
You'd need Guzzitech adaptors and maybe a few 10mm (that is, for M10 bolt) shims just to make sure they line up perfectly.

My pads are about 0.5mm below the outside of the disc so pretty perfect.

That said, my forks are Marzos so you'd have to check up on adaptor fitment- reckon Red must have something.  The o/e discs weigh a ton- EBCs which are a direct bolt on are a deal lighter.
 
Dale,

I've done a conversion with the 4-pot Beemer calipers on stock size discs.  Fits Ceriani only, just needs a couple of spacers.

Used stainless rotors and works well with the stock M/C.

Can supply rotors, calipers and spacers if you like.

I'd include a pic but our forum server won't allow it at the moment... ???

piet
 
Thanks!

Here it is, for the benefit of others that may be interested...

piet
 

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Hi Piet

I was thinking of the Brembo Gold lines like you see on the Zanes, but these fit without an adapter plate, so are a distinct advantage.

How is the operation/stopping power by comparison with the gold ones?
What about availability of re-build kits?
 
Rebuild kits should be avaiable through Beemer dealers, but all the Brembo 4-potters seem very robust, haven't needed to rebuild one as yet.

Because the piston sizes and location are identical to the Goldliners, stopping power should also be identical.  Pad size is also very similar, so it probably all boils down to how well pads and discs work together.  Wide variety of pads available.

piet
 
I was under the impression that the 4 pot calipers rebuild kits ain't available.Correct me if I'm wrong as it would be handy to know I can rebuild them if I need to.
 
Rob,

I can source rebuild kits for 30/34 Brembos.  They are offered as "for racing purposes only", probably to bypass any liability issues.  I understand Brembo withdrew the 4-pot kits after some twat that didn't know right from left sued them because he had hurt himself after rebuilding his calipers...

I suspect the "racing" kits will fit the other 30/34 calipers as well.  Come complete with seals and pistons.  From Brembo factory spec sheets, I cannot detect any differences in seals or piston dimensions between road and race calipers.

Cannot completely confirm though, as I haven't needed to rebuild a 4-potter yet!

piet
 
Well that's handy to know Piet, cheers for that. I haven't needed to rebuild my set either yet as they have been sitting on the shelf for the last several years. I found it hard to believe that you'd have to bin them once they started leaking.
About to fit them to the Motodd with the new GSXR rims. The calipers I brought were the 65mm spacings and I haven't found adapters to match them to 310mm discs. Any ideas??? Otherwise I was thinking of making my own.
 
motoddrob said:
About to fit them to the Motodd with the new GSXR rims. The calipers I brought were the 65mm spacings and I haven't found adapters to match them to 310mm discs. Any ideas??? Otherwise I was thinking of making my own.
Click to expand...

Give Red a call, he has adapters for 65mm Brembos to Marzocchis and stock discs.  He'll probably be able to knock up a set for you in no time... just a slight change in the CNC programming.

piet
 
Already spoken to Red, doesn't have 65mm spacing 310mm disc plates and wasn't forthcoming with an offer to tweak his CNC program to suit so I figured I'd knock some up with my trusty router, pillar drill and bandsaw.
 
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