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Brake discs

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red leader one View Drop Down
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    Posted: 24 Dec 2016 at 13:55
I've been wondering where the above for 1970/80/90's bikes come from as they will be steel.

The rust would worry me.
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Brian UK View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 24 Dec 2016 at 16:31
The trick is to keep using them, then the rust isn't a problem.
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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: 24 Dec 2016 at 17:40
Eh? The originals go rusty. Sometimes overnight.


"Chicken nuggets don't dance on a Tuesday."
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johnno View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote johnno Quote  Post ReplyReply Direct Link To This Post Posted: 24 Dec 2016 at 17:58
i had my 750 off the road for over a year and the  discs got covered in rush . Once back on the road and a few miles of braking and they were perfect again
GSXR1100 L ,Moto Guzzi 650tt/ntx.750xpa,t5 850.1100 sport,1100 sport corsa rider
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ReggieV Quote  Post ReplyReply Direct Link To This Post Posted: 24 Dec 2016 at 19:31
HMB in Germany do stainless discs for a lot of models, and of course, these wont rust!. In fact I've just bought some for my latest restoration.
 
 
and scroll down.
 
The discs (standard) on my other Guzzi are very rusty by the end of the Winter lay off.
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Brian UK View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 24 Dec 2016 at 21:55
All Bike Engineering make stainless discs for some Guzzi models.
Brian.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote BondEquipe Quote  Post ReplyReply Direct Link To This Post Posted: 25 Dec 2016 at 14:27
Just one of those things.  Easy way to tell if someone still has the linked brakes!
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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: 26 Dec 2016 at 14:09
Originally posted by ReggieV ReggieV wrote:


The discs (standard) on my other Guzzi are very rusty by the end of the Winter lay off.


Yep. Bit of use while riding then all rubbed off. Until the next time.

Big smile



"Chicken nuggets don't dance on a Tuesday."
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Jerry atric View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Jerry atric Quote  Post ReplyReply Direct Link To This Post Posted: 26 Dec 2016 at 17:05
Am I a dinasour? I thought that cast iron discs were the dog's do dahs and that stainless was a fashion thing that didn't work so well. Is that failing now overcome by use of modern pads?or am I just wrong?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 26 Dec 2016 at 17:11
Cast iron has a higher coefficient of friction, so theoretically works better. You never see stainless discs on anything but bikes.
Brian.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Jerry atric Quote  Post ReplyReply Direct Link To This Post Posted: 26 Dec 2016 at 17:19
Ah right. I remember in the 70s/80s the Jap stainless disc brakes being dreadful in the wet. How have manufacturers overcome that?
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ReggieV View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ReggieV Quote  Post ReplyReply Direct Link To This Post Posted: 26 Dec 2016 at 17:31
Jerry atric wrote;
Am I a dinasour? I thought that cast iron discs were the dog's do dahs and that stainless was a fashion thing that didn't work so well. Is that failing now overcome by use of modern pads?or am I just wrong?
 
Prior to purchase, I asked Michael at HMB exactly that question, and he stated that  "The pads and Dimensions are identical to the steel disc, but these discs have no more corrosion and better performance in wet and dry conditions. when using correct pads (07BB1408)."
The pads in question are "carbon-ceramic" which I have purchased, but I won't be able to give my impressions for a couple of months or so.


Edited by ReggieV - 26 Dec 2016 at 17:35
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ReggieV View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ReggieV Quote  Post ReplyReply Direct Link To This Post Posted: 26 Dec 2016 at 17:38
The other advantage as far as I was concerned was that the discs X 2, were about 50 Euro cheaper than buying cast iron from Stein Dinse, so as long as what I've been told turns out to be correct, it's a win, win situation for me. Smile
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Post Options Post Options   Thanks (0) Thanks(0)   Quote BondEquipe Quote  Post ReplyReply Direct Link To This Post Posted: 26 Dec 2016 at 18:37
Originally posted by Jerry atric Jerry atric wrote:

Ah right. I remember in the 70s/80s the Jap stainless disc brakes being dreadful in the wet. How have manufacturers overcome that?

Pads materials have changed massively since then. I would imagine that the metallurgy of the discs is far more scientific than it was when just not rusting was the aim.

Not to imply that you aren't a dinosaur, of course!  Wink
Stephen
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Jerry atric View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Jerry atric Quote  Post ReplyReply Direct Link To This Post Posted: 26 Dec 2016 at 22:22
Thanks chaps that's very informative and answers my question. I s'pose now isn't the time to confess to 3 new sets of EBCs finest recently fitted to the old girl's rusty discs I'm not proud.
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