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Brakes and disks V35 V50

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GC888 View Drop Down
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    Posted: 23 Oct 2017 at 13:26
Well the restoration of the v35 is well underway! 

One of the jobs that I did not think would be an issue has just become one! 

The discs or rotors have significant pitting on them, not the sort of pitting that will easily grind out! 

OK its possible to buy new but what I have seen are not cheap. 

So a few questions - 

Given that the discs are obsolete and rust for the fun of it this must be a problem others have found - does anything else fit?  The rear disc is possible the most difficult as there are no tolerances. But the front disks have more potential as spacers and shims can be make things fit.  

Who can supply replacement discs ? 

Who can repair the discs? 

Any other suggestions? 

Thanks 
G


 
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red leader one View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote red leader one Quote  Post ReplyReply Direct Link To This Post Posted: 23 Oct 2017 at 16:01
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Post Options Post Options   Thanks (0) Thanks(0)   Quote GC888 Quote  Post ReplyReply Direct Link To This Post Posted: 23 Oct 2017 at 16:14
Thanks for the links 

I did look over eBay but the condition looks worse than mine!

ISR - I'm sending off a quote (not sure if there is any discount for bulk but will check back to see if its interesting) 

There is also the Disk Doctor in Sheffield though grinding them will take them below 'recommended' thickness. 

My other option is in a couple of weeks there is a big auto jumble in Milan where Guzzi parts are very common - could be fun getting disks through security !!!

Any other ideas gratefully accepted. 


The callipers are a relatively easy fix to clean up and check over/replace seals etc. 
 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote c13pep Quote  Post ReplyReply Direct Link To This Post Posted: 23 Oct 2017 at 19:57
Discs are still listed on various Guzzi spares sites (Harpers, OEM etc.) but as you say they are extremely expensive but not obsolete.
Skimming them on a lathe works but watch out for minimum thickness, however they are quite meaty and this is the cheapest option.
It is likely that other Italian marques used the same discs but cross referencing could be a nightmare (Laverda, Benelli, Gilera, Ducati). The points plate etc. on the V50/3 are said to be from Benelli for instance.
My own discs were skimmed on my mates lathe and have so far done the job very well with regular pad changes now factored in.
CHRIS
you can`t have any fun in a straight line

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GC888 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote GC888 Quote  Post ReplyReply Direct Link To This Post Posted: 24 Oct 2017 at 08:17
Hi Chris - thanks 

After measuring them up to get a quote for a new set I found they were 6mm thick, as most bike discs these days start at 5mm that gives lots of scope for grinding out the pitting; so its now as you have confirmed the right way to go (along with regular pad changes).

Cross referencing may not be that much of a mare - far fewer people were making discs back then in Italy and you only need to look at the design period prior to production for Italian bikes - will have a chat to a few people in Italy next month! - could be a new thread - what else fits ! 

  
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Post Options Post Options   Thanks (0) Thanks(0)   Quote iansoady Quote  Post ReplyReply Direct Link To This Post Posted: 24 Oct 2017 at 12:21
I understand that the V50 discs were actually made by Moto Guzzi so alternatives may be hard to come by.
Ian
1982 V50
1952 Norton ES2
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Little Nellie Quote  Post ReplyReply Direct Link To This Post Posted: 24 Oct 2017 at 17:48
I believe these discs are obsolete now. I've been looking for some front V50 II discs for months now, without success. As you say, the ebay stuff is pretty worn out and looks a bit dodgy. After all, its your life you're talking about here so worth the investment to buy new.

The V50 Mk2 disc has a deeper offset compared to the V50 Mk3.  I think what you need to do is purchase some V50 mk3 shallow offset discs (£116 Gutsibits) and some V35 Florida disc spacers to make up the required offset. Talk to the guys at Gutsibits, they know their stuff. 
Ray
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dennis menace Quote  Post ReplyReply Direct Link To This Post Posted: 25 Oct 2017 at 20:13
I used a Powrehouse kit to service my calipers with no problems but if you use and air line to pop out the pots use a thick rag to catch them and point away from yourself; they can go like mortar rounds! I bought second hand discs from Gutsibits as mine were warped. Price was reasonable.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dennis menace Quote  Post ReplyReply Direct Link To This Post Posted: 25 Oct 2017 at 20:16
PS make sure you meausre up and get the right seal kit. My calipers are Grimeca and although they have the same mounting points on the forks as Brembo the pots are a different size and the seals have a different size and profile. But if you get the right kit the job is straightforward.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote cyclobutch Quote  Post ReplyReply Direct Link To This Post Posted: 30 Oct 2017 at 12:50
The surface on my discs is horrible. Brakes still work well, still passes MOTs. Pad life is still OK.
Butch
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T3 - 'Blue'
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Post Options Post Options   Thanks (0) Thanks(0)   Quote GC888 Quote  Post ReplyReply Direct Link To This Post Posted: 02 Nov 2017 at 17:33
OK to end this story - did end up getting them ground/skimmed. 

at thediscdoctor.co.uk - nice bloke and a biker the pitting was mostly in the first 1/4 mm so taking them down to 5.5mm was fine and will keep them within specification. 

Interesting finding the base disc is coated with a much hard surface, so a possibility why when they are good they are fine but left alone will rust quickly. 

Got issues - get them ground flat & its much cheaper than new discs !
  
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Post Options Post Options   Thanks (0) Thanks(0)   Quote telegraphroad Quote  Post ReplyReply Direct Link To This Post Posted: 02 Nov 2017 at 18:24
Do you mind me asking how much they charged per disc?
V50 Monza
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Post Options Post Options   Thanks (0) Thanks(0)   Quote GC888 Quote  Post ReplyReply Direct Link To This Post Posted: 02 Nov 2017 at 18:26
£40 but haggle ;-) 

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Post Options Post Options   Thanks (0) Thanks(0)   Quote iansoady Quote  Post ReplyReply Direct Link To This Post Posted: 03 Nov 2017 at 11:12
Were they originally plated?
Ian
1982 V50
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Post Options Post Options   Thanks (0) Thanks(0)   Quote GC888 Quote  Post ReplyReply Direct Link To This Post Posted: 03 Nov 2017 at 11:16
As in electro plate to provide some rust protection - yes almost certainly 

However thats long gone on mine 
 
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