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New disc issue

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Cracker
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New disc issue

Post by Cracker » Fri Jan 05, 2018 1:05 am

Bought a new pair of front discs online & both have a “groove” on the edge I didn’t think looked right.
Are they faulty? Cheers in advance.
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warmasice
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New disc issue

Post by warmasice » Fri Jan 05, 2018 1:13 am

Cracker wrote: Fri Jan 05, 2018 1:05 amBought a new pair of front discs online & both have a “groove” on the edge I didn’t think looked right.
Are they faulty? Cheers in advance.
Seen it many times before. Its just removal of excess material to ensure the disc is balanced. Fit away. :thumbsup:
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New disc issue

Post by Cracker » Fri Jan 05, 2018 1:36 am

warmasice wrote: Fri Jan 05, 2018 1:13 am
Cracker wrote: Fri Jan 05, 2018 1:05 amBought a new pair of front discs online & both have a “groove” on the edge I didn’t think looked right.
Are they faulty? Cheers in advance.
Seen it many times before. Its just removal of excess material to ensure the disc is balanced. Fit away. :thumbsup:
Cheers for that Warmasice. Appreciate it :thumbsup:
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New disc issue

Post by VRSteve » Fri Jan 05, 2018 5:56 pm

warmasice wrote: Fri Jan 05, 2018 1:13 am Seen it many times before. Its just removal of excess material to ensure the disc is balanced. Fit away. :thumbsup:
No its not.
Its a wear indicator. When the material on the outside of the groove is worn the disk is at the end of its useful life.
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New disc issue

Post by Nictrix » Fri Jan 05, 2018 5:58 pm

VRSteve wrote: Fri Jan 05, 2018 5:56 pm
warmasice wrote: Fri Jan 05, 2018 1:13 am Seen it many times before. Its just removal of excess material to ensure the disc is balanced. Fit away. :thumbsup:
No its not.
Its a wear indicator. When the material on the outside of the groove is worn the disk is at the end of its useful life.
:lol:
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New disc issue

Post by VRSteve » Fri Jan 05, 2018 5:59 pm

Nictrix wrote: Fri Jan 05, 2018 5:58 pm
VRSteve wrote: Fri Jan 05, 2018 5:56 pm
warmasice wrote: Fri Jan 05, 2018 1:13 am Seen it many times before. Its just removal of excess material to ensure the disc is balanced. Fit away. :thumbsup:
No its not.
Its a wear indicator. When the material on the outside of the groove is worn the disk is at the end of its useful life.
:lol:

Here you go

https://www.6speedonline.com/forums/996 ... nyway.html

You can apologise on here, or by PM. I'm not fussed.
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New disc issue

Post by Nictrix » Fri Jan 05, 2018 6:05 pm

VRSteve wrote: Fri Jan 05, 2018 5:59 pm
Nictrix wrote: Fri Jan 05, 2018 5:58 pm
VRSteve wrote: Fri Jan 05, 2018 5:56 pm No its not.
Its a wear indicator. When the material on the outside of the groove is worn the disk is at the end of its useful life.
:lol:
Happy to be proved wrong.
I really cant see it being wear indicators for a few reasons.
The amount of material taken off the disc to reach that level would be huge.
When the disc wears it never wears at the edges so it would be difficult to see if the disc had reached these marks.
If it was wear marks surely they would have them the same sort of size equally spaced around the disc.
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New disc issue

Post by VRSteve » Fri Jan 05, 2018 6:10 pm

Nictrix wrote: Fri Jan 05, 2018 6:05 pm
VRSteve wrote: Fri Jan 05, 2018 5:59 pm
Nictrix wrote: Fri Jan 05, 2018 5:58 pm :lol:
Happy to be proved wrong.
I really cant see it being wear indicators for a few reasons.
The amount of material taken off the disc to reach that level would be huge.
When the disc wears it never wears at the edges so it would be difficult to see if the disc had reached these marks.
If it was wear marks surely they would have them the same sort of size equally spaced around the disc.
Oh so your laughing at me, although you have no idea yourself....you just think I'm wrong.

As I said in my post above, the link shows my reasoning, and corroborates my view.
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New disc issue

Post by Nictrix » Fri Jan 05, 2018 6:17 pm

VRSteve wrote: Fri Jan 05, 2018 6:10 pm
Nictrix wrote: Fri Jan 05, 2018 6:05 pm
VRSteve wrote: Fri Jan 05, 2018 5:59 pm Happy to be proved wrong.
I really cant see it being wear indicators for a few reasons.
The amount of material taken off the disc to reach that level would be huge.
When the disc wears it never wears at the edges so it would be difficult to see if the disc had reached these marks.
If it was wear marks surely they would have them the same sort of size equally spaced around the disc.
Oh so your laughing at me, although you have no idea yourself....you just think I'm wrong.

As I said in my post above, the link shows my reasoning, and corroborates my view.
Oh, I see you edited your post while I was answering.
Sorry, yes I did laugh at that and if you are correct I apologise.
I have never heard of this and still honestly dont think its right.
Who is the marks for? If its for the owner of the vehicle to visually check the disc thickness it would be very difficult to see on the car with wheels in the way and also as I said the fact that the edges of the disc dont wear.
If its for a garage, do they not measure the disc as there is normally a stamp on the disc saying minimum thickness?
As I said if you are correct I apologise.
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New disc issue

Post by Nash3vans » Fri Jan 05, 2018 6:27 pm

Either way they aren't faulty :D
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New disc issue

Post by buzyg » Fri Jan 05, 2018 6:35 pm

I think it's done to ballance the disks during manufacture. Not noticed it on mine though.

See Link. As You Tube seems to have stopped working when embedded into a forum post recently.

https://www.youtube.com/watch?v=vIJf29CFnbo

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New disc issue

Post by Nictrix » Fri Jan 05, 2018 6:49 pm

So whats correct?
A forum post from 4 years ago or a youtube video from 6 years ago.
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New disc issue

Post by buzyg » Fri Jan 05, 2018 7:11 pm

Nictrix wrote: Fri Jan 05, 2018 6:49 pmSo whats correct?
A forum post from 4 years ago or a youtube video from 6 years ago.
Not sure I understand the point of your question. :?

However I believe the video is, as it clearly shows how the marks are made. Plus there are other similar video's of brakes being balanced using this method, all over the internet. :wink:
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New disc issue

Post by Beedub » Fri Jan 05, 2018 7:40 pm

This is a brake rotor balancing method....

heres the machine that does it...

http://www.directindustry.com/prod/cemb ... 39494.html
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New disc issue

Post by VRSteve » Fri Jan 05, 2018 7:57 pm

In my garage I have a set of disks of HRH's mini.

The grove cut in the disk measures 8.4mm, the same as the minimum thickness stamped on the front of the disk.

I measured using a digital calliper, so I am MORE than happy that I'm correct in what I say.
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