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Brakes and disks V35 V50

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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: 03 Nov 2017 at 11:46
I'm fairly sure they were just cast iron discs, which gives the best coefficient of friction. Any plating would reduce that.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote cyclobutch Quote  Post ReplyReply Direct Link To This Post Posted: 03 Nov 2017 at 14:45
No - they would have been bare iron from new.
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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 23:33
Nope much higher quality 

my guess is a base steel disc 

Hard coating on the disc face 

then electro plated - this may or may not have been on the disc face but its certainly on the edge and centre 


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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 04 Nov 2017 at 09:52
Unless you are talking about some aftermarket disc, definitely no, they are machined cast iron.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote c13pep Quote  Post ReplyReply Direct Link To This Post Posted: 04 Nov 2017 at 10:13
Is there a makers name on the disc as this might clear up the confusion, because original discs do `rust for fun` as did my BMW R1150R as do most cars on the road, which suggests that there is no coating, if there were then what would it be for? Now that you have skimmed the discs then any coating on the faces will have been compromised or even removed.
Not withstanding all this the brakes will now be a lot more responsive with less fade which was my own experience having done the same thing.(mine were original Guzzi)
CHRIS
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Post Options Post Options   Thanks (0) Thanks(0)   Quote GC888 Quote  Post ReplyReply Direct Link To This Post Posted: 16 Dec 2017 at 18:29
Hi Brian - the ones on mine are certainly original and not cast iron.

Looking carefully at the way they have been made I would say that they are steel.

Marks on the buttresses suggest they were punched out then dished in a press.
Final part of the process was the 1mm coating of (carbon steel) that is exceptionally hard

I don't know that its carbon steel but that would be hard and rust for fun! 

C13pep 

I have looked carefully but not found any makers names/numbers/marks which would fall in with being manufactured by MG OEM.

The plating only remained on some of the edge but It looked like unsubstantial chrome/nickel or a bright finish (I guess to stop them rusting in the showroom!) 

The coating is .5mm on each face so took it down by only .25mm on each face which while it has not removed all the pits its taken off enough to provide a clean sweep. But it will certainly have been compromised and will need an eye keeping on them.
   
 



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Post Options Post Options   Thanks (0) Thanks(0)   Quote cyclobutch Quote  Post ReplyReply Direct Link To This Post Posted: 18 Dec 2017 at 10:57
I think that the V50 II were potentially fitted with two different types of discs at the front. The earlier ones were undrilled whilst the later ones were drilled. Not sure if the offset was changed at the same time.
Butch
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 18 Dec 2017 at 13:19
I didn't think the drilling happened until the III came along.
 
I have seen no reference to two different discs in the parts manuals so I doubt the offset changed.
 
But it is Guzzi.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote cyclobutch Quote  Post ReplyReply Direct Link To This Post Posted: 18 Dec 2017 at 14:32
Originally posted by Brian UK Brian UK wrote:

I didn't think the drilling happened until the III came along.
 
I have seen no reference to two different discs in the parts manuals so I doubt the offset changed.
 
But it is Guzzi.

My pal had a mk II new - defo had the drilled front disks. Typical Guzzi parts bin assembly you might suppose.
Butch
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Post Options Post Options   Thanks (0) Thanks(0)   Quote GC888 Quote  Post ReplyReply Direct Link To This Post Posted: 18 Dec 2017 at 16:45
Originally posted by cyclobutch cyclobutch wrote:

Originally posted by Brian UK Brian UK wrote:

I didn't think the drilling happened until the III came along.
 
I have seen no reference to two different discs in the parts manuals so I doubt the offset changed.
 
But it is Guzzi.

My pal had a mk II new - defo had the drilled front disks. Typical Guzzi parts bin assembly you might suppose.


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Post Options Post Options   Thanks (0) Thanks(0)   Quote redmunk Quote  Post ReplyReply Direct Link To This Post Posted: 18 Dec 2017 at 22:57
Originally posted by cyclobutch cyclobutch wrote:

Originally posted by Brian UK Brian UK wrote:


I didn't think the drilling happened until the III came along.
 
I have seen no reference to two different discs in the parts manuals so I doubt the offset changed.
 
But it is Guzzi.


My pal had a mk II new - defo had the drilled front disks. Typical Guzzi parts bin assembly you might suppose.

I've got an early mkII and it's got drilled discs too.

On rust removal, mine had barely perceptible wear and a heavy but uniform coat of rust from sitting. Left them on the wheel and spun it slowly while using a wire brush in a drill, which slowly took off all the rust. I wouldn't use a flap wheel, think it would be too aggressive.
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