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Author Topic: Brembo Brakes cb750  (Read 42183 times)

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Offline stueveone

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Brembo Brakes cb750
« on: December 27, 2008, 05:12:29 PM »
Screw stock cb750 calipers. Tried everything to get them to stop squeeling. Pad notches, x's, rubber o-rings, paste, disc quiet, Voodoo, witchcraft. #*&$@ those things!
Besides the above being a concern for not wanting to do the classic dual brake swap, I also want to cut down on weight especially sprung weight (which, as Hondaman pointed out, negatively affects handling) but also want to improve baking.
So. ..
I got a set of Brembo calipers off a Ducati Sport Classic. These are designed for spoked wheels with a "slim" profile with dual pistons on the outside. They are built for 320mm rotors. I think I'm going to try and use it single sided first (again, weight). I also want to make this build as inexpensive as possible, so I want to use as much stock equipment as possible.
I'm thinking about using the stock CB forks and building a bracket for the new Duc caliper that uses the 3 bolt hole pattern for the stock brake hanger. Any thoughts on this? Think it will hold?
The alternative is getting a GL1000 front end and very straightforwardly bolting the new caliper to that.
What'd you guys think?

stueve



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Offline jaguar

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Re: Brembo Brakes cb750
« Reply #1 on: December 27, 2008, 06:08:12 PM »
love to hear how this works out
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Luke

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Re: Brembo Brakes cb750
« Reply #2 on: December 27, 2008, 06:23:45 PM »
Soak pads in kerosene hang and let drip dry install and ride on.
Old school kz guy swears by it so do I.
What you got to loose a sqeeeel     Luke 
« Last Edit: December 27, 2008, 06:51:57 PM by Luke »
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Offline Jim F

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Re: Brembo Brakes cb750
« Reply #3 on: December 27, 2008, 08:48:48 PM »
Will get you some pictures tomorrow of the adapter plates for my
project, I have been busy this week with work, sorry

Jim

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Offline Terry in Australia

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Re: Brembo Brakes cb750
« Reply #4 on: December 27, 2008, 10:55:03 PM »
So the calipers are only 2 pistons, (on the outer side) and presumable, can be split like the CB750's OEM caliper? If so, I can't see why you couldn't "swing" it on a specially made bracket mate, why not?

I didn't know that Brembo made those sort of calipers, most Jap bikes made during the 1980's used similar "2 pot" calipers, including Honda's CBR1000/600, and they worked fine. Let us know how it works out! Cheers, Terry. ;D
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Offline fishhead

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Re: Brembo Brakes cb750
« Reply #5 on: December 28, 2008, 05:20:17 AM »
I've been doing this same thing for years.

http://www.geocities.com/fischervintagecycle/Fischheads.html
 

Get a different fork assembly with the caliper mounts on the outside of the fork legs and get rid of the swinging caliper arrangement that the CB has. This makes the brake conversion easier. I like the GL 1000 forks for this. The GL forks also have a wider spacing and have more possibilitys than other fork assemblies.

 Brembo brake calipers are nice, but they are often heavier than an OEM equivilant type caliper. The same goes for their discs.

The first 2 pics are GL 1000 Front ends . The next 2 pics are Yamaha XS . The last pic is Kawasaki KZ.
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Offline KB02

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Re: Brembo Brakes cb750
« Reply #6 on: December 28, 2008, 05:53:03 AM »
One thing to keep in mind is this: On all brake set ups, you have either a "floating caliper" or a "floating disk." You can't have both float, and you can't have both static, it has to be one of each.

If you look at Fishhead's pictures, those are all floating disks (if you grab the disk, you can flex it around a little bit).

The stock Honda stuff uses a floating caliper (hence the pivot).
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Offline voxonda

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Re: Brembo Brakes cb750
« Reply #7 on: December 28, 2008, 06:39:09 AM »
Quote from: KB02 on December 28, 2008, 05:53:03 AM
One thing to keep in mind is this: On all brake set ups, you have either a "floating caliper" or a "floating disk." You can't have both float, and you can't have both static, it has to be one of each.

If you look at Fishhead's pictures, those are all floating disks (if you grab the disk, you can flex it around a little bit).

The stock Honda stuff uses a floating caliper (hence the pivot).

You can have a both static setup as long as you have opposit moving pistons.
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Offline Ricky_Racer

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Re: Brembo Brakes cb750
« Reply #8 on: December 28, 2008, 06:40:12 AM »
Good to see you, Dan! 

Does anyone have any info on the reasons for the move from solid to floating design, since the limits of braking are affected by other factors.  Is the newer design the result of attempting to 1) improve wear,  2) improve modulation, 3) loosen critical tolerances, 4) fashion...  or what?   ???  RR

« Last Edit: December 28, 2008, 06:53:42 AM by Ricky_Racer »
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Offline Joksa

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Re: Brembo Brakes cb750
« Reply #9 on: December 28, 2008, 07:55:05 AM »
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Offline fishhead

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Re: Brembo Brakes cb750
« Reply #10 on: December 28, 2008, 08:00:18 AM »
  None of the pictured brake set up have "true" full floating discs, most are semi floating discs (spring loaded buttons). A few of them have solid mounted buttons in them.
 All calipers have "float" built into them. The 2 piston calipers pictured all float on slides on the caliper mount (simular to the KZ 900 calipers, they slide on shafts).
 The 4 and 6 opposed piston calipers all have the "float" in the pistons. Having the calipers/pistons float is how they automatically adjust for wear in the pads.
 The floating discs are supposed to be self centering . I find them to just rattle and make more noise than needed.
  
 2 Yamaha XS's single disc set ups with full floating discs. These were pretty noisy.
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Offline 754

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Re: Brembo Brakes cb750
« Reply #11 on: December 28, 2008, 09:28:56 AM »
I picked up radial calipers off an 05 R6.

Looks like not even worth trying to mount on pre 76 CB forks. I do have a 78 F fork that looks like I can mount blocks to (mucho milling), that will then take the radial calipers. Not sure what disc I will use yet, but I think I can get it to work, dont like the looks of the f forks, but they seem to be the solution. Do F forks handle better than K,s?
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Offline Ricky_Racer

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Re: Brembo Brakes cb750
« Reply #12 on: December 28, 2008, 11:11:32 AM »
... and has anyone milled/ground the ridges off the "F" forks?  Are they really necessary other than to give Honda a 20,000% safety margin?  RR
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Offline 754

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Re: Brembo Brakes cb750
« Reply #13 on: December 28, 2008, 11:20:05 AM »
I think that is the part I really hate, or maybe that and the comstar together..

 I wonder if M Rieck redrilled his discs to mount wire wheels or?? I can picture a nice billet hub with a 5 spoke disc pattern, would look slick..moreso if it had straight pull spokes..
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Maker of the WELDLESS 750 Frame Kit
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Kelowna B.C.       Canada

My next bike will be a ..ANFOB.....

It's All part of the ADVENTURE...

73 836cc.. Green, had it for 3 decades!!
Lost quite a few CB 750's along the way

Offline stueveone

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Re: Brembo Brakes cb750
« Reply #14 on: December 28, 2008, 12:24:04 PM »
Fishhead, what are you thoughts on building a bracket to replace the floating hanger on the stock CB setup? Doable?
As far as. . .
GL1000 vs stock CB750 forks? Which is heavier? The fork offset is wider, what about length? How does the GL fork affect handling?
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Offline Terry in Australia

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Re: Brembo Brakes cb750
« Reply #15 on: December 28, 2008, 04:41:02 PM »

The F2/F3 forks use the same "guts" as the K3-K8 F/F1 forks, so there shouldn't be any real difference in handling, although the F2/F3 was considered to be a sweeter handling bike than it's forebears.

I guess you could machine the strengthening ribs off them if you wanted to, but the bodies are pretty thin otherwise, so I wouldn't.

I hear much "slagging off" of Comstar wheels, but they were a race developed revolution at the time, much lighter than the sand cast alloy wheels of the same era, much stronger (or at least, less "flexible") than spoked wheels, and suitable for use with high speed tubeless radial tires.

I've heard stories here about rivets coming loose after many years and even more miles, but I've never seen any, even when I worked at a dealership. The ones on my F2 are perfect, even though the rest of the bike was totally stuffed when I bought it. Cheers, Terry. ;D
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I was feeling sorry for myself because I couldn't afford new bike boots, until I met a man with no legs.

So I said, "Hey mate, you haven't got any bike boots you don't need, do you?"

"Crazy is a very misunderstood term, it's a fine line that some of us can lean over and still keep our balance" (thanks RB550Four)

Offline voxonda

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Re: Brembo Brakes cb750
« Reply #16 on: December 29, 2008, 01:18:23 AM »
The only rivets I saw that came loose where on my CB900 after 4 years of riding with a sidecar.
The comstars where not designed for these kind of forces.

Cheers.
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Offline lordmoonpie

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Re: Brembo Brakes cb750
« Reply #17 on: December 29, 2008, 02:58:51 AM »
I have a nice static caliper - static rotor setup on my bomber. Difference is that I have a twin opposed piston classic race caliper from AP lockheed. As Voxonda says this is perfectly OK since it's the piston travel that takes up any offcentering of the rotor within the caliper.

These are awesome stoppers, very light and easy to install. This setup in the pic uses a welded 10mm plate onto the fork leg (a cb550 in this case) and you just need to shave off the back of the caliper to clear the spokes.

I've been racing this for about 6 years now although recently upgraded to a magnesium custom fork leg to get the CB750 cast iron rotor to work with the same caliper. Stands on its nose any time I need it to now  ;D

I'm so totally fed up with the stock K0 CB750 calipers on my 750 that I'm contemplating changing this as well to an AP setup. The stock calipers look fantastic but they leak fluid out of the bleed nipples however hard I tighten them and so I get a spongy lever in no time. If I cannot seal them, it's back to the drawing board for the 750 as well...

Oh btw - if anyone is interested, the Bomber (much developed since this pic.) is now up for sale  :(
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Offline Terry in Australia

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Re: Brembo Brakes cb750
« Reply #18 on: December 29, 2008, 03:09:43 AM »
Oooer, that's a nice looking jigger, Lord Moonie! ;D
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I was feeling sorry for myself because I couldn't afford new bike boots, until I met a man with no legs.

So I said, "Hey mate, you haven't got any bike boots you don't need, do you?"

"Crazy is a very misunderstood term, it's a fine line that some of us can lean over and still keep our balance" (thanks RB550Four)

Offline lordmoonpie

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Re: Brembo Brakes cb750
« Reply #19 on: December 29, 2008, 03:12:42 AM »
Quote from: Terry in Australia on December 29, 2008, 03:09:43 AM
Oooer, that's a nice looking jigger, Lord Moonie! ;D
Why thank you Young Man! Actually this is a real old photo - must post a more recent one :)
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Offline Retro Rocket

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Re: Brembo Brakes cb750
« Reply #20 on: December 29, 2008, 03:14:59 AM »
More pics of the " jigger" please.. ;)

Mick
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Offline lordmoonpie

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Re: Brembo Brakes cb750
« Reply #21 on: December 29, 2008, 11:39:26 AM »
Quote from: retro rocket on December 29, 2008, 03:14:59 AM
More pics of the " jigger" please.. ;)

Mick
I'm beginning to worry about what a "jigger" might be....oh well, here she is with her clothes on...
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Offline lordmoonpie

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Re: Brembo Brakes cb750
« Reply #22 on: December 29, 2008, 11:40:38 AM »
....and clothes off (Bet Bobby R is here in a flash :))
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Offline jaguar

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Re: Brembo Brakes cb750
« Reply #23 on: December 29, 2008, 12:06:45 PM »
any chance of making more then one set of adaptor plates?
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Offline bwaller

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Re: Brembo Brakes cb750
« Reply #24 on: December 29, 2008, 12:20:10 PM »
Nicely sorted LMP, very nice indeed.
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