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Un-Linking Linked Brakes

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Ingegnere View Drop Down
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    Posted: 16 Jan 2015 at 19:33
As we've ridden bike without linked brakes and are quite happy with this arrangement is there a kit to unlink Guzzi linked brakes?
 
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Jim Mac View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Jim Mac Quote  Post ReplyReply Direct Link To This Post Posted: 16 Jan 2015 at 19:45
Haapens every now and again, someone will be along soon to advise, but most prefer them
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Mike H View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mike H Quote  Post ReplyReply Direct Link To This Post Posted: 16 Jan 2015 at 20:23
If memory serves I think there may be a problem with the piston capacitiy of the master cylinders, especially the handlebar lever one which quite likely will pull back to the handlebar grip when trying to operate 2 discs, because it's shifting more fluid, that would be an MOT fail. You would have to change the M/C then for a twin disc type.
  
Not sure how the foot brake would behave with just one disc. But it's not as simple as just get custom hoses and rerouting I don't think.
 
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Ken-Guzzibear View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ken-Guzzibear Quote  Post ReplyReply Direct Link To This Post Posted: 16 Jan 2015 at 20:33
the linked brakes on a road bike are utterly brilliant and it wasn't until ABS came in that it was bettered However if you want to do it you will need to get an aftermarket jap bike front master cylinder to work both front discs ....
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Ingegnere View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ingegnere Quote  Post ReplyReply Direct Link To This Post Posted: 16 Jan 2015 at 20:33
I thought it would be a new front M/C just wondering if there was a known replacement, before I got into looking at scrapping the current system and fitting something else.  I know Laverda's use similar size disks, so that was going to be a starting point for a new bar mounted M/C but that could get out of hand as there is a Ducati Monster Brembo Gold Line conversion for these with a Honda Fireblade M/C so things could get out of hand very quickly.
As for the rear I assume the rear M/C would have too much capacity and require replacing, again looking for a known change...
 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ingegnere Quote  Post ReplyReply Direct Link To This Post Posted: 16 Jan 2015 at 20:43
Hi Ken,
          Thanks for your input but we only tend to use the rear brake for slow speed work only, the Guzzi's I've ridden with linked brakes were a pain in traffic and didn't inspire confidence when pushing on as I felt it really upset the balance of the bike as the front end really didn't feel as though the weight was transferring and putting weight through the front wheel thus increasing grip and feel.  It's a personal thing but it felt odd and I was glad to get back on my bike with conventional brakes.
 
Also as I don't want to adjust my riding style I'd burn out one front disk on the bike which isn't great.
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Ken-Guzzibear View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ken-Guzzibear Quote  Post ReplyReply Direct Link To This Post Posted: 16 Jan 2015 at 21:20
Depends on the Guzzi the V11 is conventional the V1000 linked and to be fair on that fully loaded it is utterly brilliant , but it does depend on the bike and your riding style. I would suggest it may be worth asking Brembo or Motomecca for the correct brake master cyl to work the 2 front discs, and the rear as just utilising the existing ones I think I read it leaves the rear over braked and more likely to lock up and the front under braked and likely to fade .... which bike is it?
The older Tonti bikes have similar calipers to those used on same era BMW soooo for a 2nd hand front M/cyl maybe a older BMW master cyl? also as you say Laverda as well as Benelli and Ducati followed similar brakes a good look at the owners sites for similar year bikes as ONLY Guzzi used linked brakes would be a starting point
I have a Honda front brake master cylinder as it is a better one I find for the front disc hauls up the V1000 nicely I had a braided hose made up with Honda fitting at the top and Brembo bottom
Hope this helps
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ianboydsnr Quote  Post ReplyReply Direct Link To This Post Posted: 16 Jan 2015 at 21:20
Originally posted by Mike H Mike H wrote:


If memory serves I think there may be a problem with the piston capacitiy of the master cylinders, especially the handlebar lever one which quite likely will pull back to the handlebar grip when trying to operate 2 discs, because it's shifting more fluid, that would be an MOT fail. You would have to change the M/C then for a twin disc type.
  
Not sure how the foot brake would behave with just one disc. But it's not as simple as just get custom hoses and rerouting I don't think.
 


The master cylinder may or may not need replaced,

I added a disc to my single disc R80RT, and the original m/c works fine, in fact it's better than my twin disc R100RT, that was factory fitted,

Foot brake will be a little harder, but should be ok,

Best to try it and see, before buying a new m/c, having said that I prefere the linked, and miss it on the other bikes, you don't need to ride around covering the front brake, and you can drag a little into corners if need be!
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Ken-Guzzibear View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ken-Guzzibear Quote  Post ReplyReply Direct Link To This Post Posted: 16 Jan 2015 at 22:12
it is something that is personal so do what you gotta do
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Post Options Post Options   Thanks (0) Thanks(0)   Quote rbt1548 Quote  Post ReplyReply Direct Link To This Post Posted: 16 Jan 2015 at 22:22
I believe it is all about getting the master cyl bore to number of piston ratio correct, or as near correct as you can, I am pretty sure the optimum ratio is round about 27 to 1.
 
This chart gives ratios and how they are achieved.
 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 16 Jan 2015 at 22:41
The reason why you think the front end felt as if the weight was not transferring is because with the linked brakes the whole bike sits down, not just the front, so you get grip on both wheels.
However, as said above, you do what suits you.


Edited by Brian UK - 17 Jan 2015 at 08:56
Brian.

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Ken-Guzzibear View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ken-Guzzibear Quote  Post ReplyReply Direct Link To This Post Posted: 17 Jan 2015 at 00:37
before you do anything with brakes DO check it will not invalidate insurance nowadays anything that alters speed power or handling and braking some companies get very funny hell one insurer wanted to DOUBLE the cost for the V11 with the rear rack added it is an oem part... others it made no difference to the annual rate ...just a thought
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