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Whats This On A Disc ?


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#1 martyntdci

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Posted 12 January 2013 - 08:21 PM

I bought these for the focus, any way upon cleaning the grease of prior to fitting one disc is sound, the other 1 i came across this and i am very very stumpped.......

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any ideas? when i got in contact with the company they said is was where they were balanced to run true.... ive never never seen these on the amount of discs i fitted in the past (old job) and when i done it on my own car etc.....

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#2 artscot79

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Posted 12 January 2013 - 08:26 PM

They are indeed to allow it to run true or balanced so to speak and allow water and dust to dissapate easily its more common on drilled disks

#3 TDCiST

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Posted 12 January 2013 - 08:26 PM

Is it a wear indicator???

Probably not, but is it worth taking it back and seeing another pair of discs??

Ive never seen it either!

EDIT: Just seen above post! Well you learn something new every day!

#4 martyntdci

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Posted 12 January 2013 - 08:30 PM

They are indeed to allow it to run true or balanced so to speak


why only on 1 disc then? i thought it should have a full wall all the way round? that why they give disc wear etc....

#5 artscot79

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Posted 12 January 2013 - 08:32 PM

Not sure why it would be one disk to be honest drilled disks have a tendancy to crack so these grooves allow dust and water to be blown off the disk allow more air between the disks to aid cooling

#6 martyntdci

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Posted 12 January 2013 - 08:43 PM

so either disc then is a dud then? tbh i thought they only cracked etc when used on track days? along with these i have goodridge braided hoses and some esp brake fluid to flush system..... thanks for this

#7 artscot79

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Posted 12 January 2013 - 09:11 PM

The disks will be fine i reckon did they come marked as to which side they fit ide imagine the disk with the groove would be for the drivers side

#8 martyntdci

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Posted 12 January 2013 - 09:20 PM

same as stated above, you learn something new everyday..... ive just never seen this before, even my other drilled/grooved disks dont have this marking on!!!

#9 Preee

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Posted 12 January 2013 - 09:27 PM

I would at least go and check another set , on the one side it looks like you only have about 4mm , if you keep car long enough to wear that down it could rip your pads apart

#10 martyntdci

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Posted 12 January 2013 - 09:32 PM

going keep the car for quite a few years yet. got a little cash thrown into it lol.... got new pads here to fit also. thats what worries me, how thin those walls are........ and its just not the tip whats cut out, its all the way down to the vents, so its about 7-8mm deep also

#11 Preee

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Posted 12 January 2013 - 09:48 PM

i would not be happy with them , vents and holes , yes i have seen them but never that much bored out of them , to remove that much metal if they were out of true , shows they were bad from the word go , and usually they are machined true , not cut out.

#12 martyntdci

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Posted 12 January 2013 - 09:57 PM

so im right in asking for either a refund or a exhange.....

Thanks for the info by the way.....

#13 Preee

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Posted 12 January 2013 - 10:04 PM

If they were both the same , then maybe they can say it's balancing , but they are not the same , i would ask to view other and exchange. Customer is always right :)

#14 martyntdci

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Posted 12 January 2013 - 10:14 PM

im sorry about this but its bugging me.... how much brake ware are you allowed on a disc before they need changing? in theory if i decide to use them i only have 3mm (just measured) of wall to use before i hit the cut out.. so after 3mm i need to replace the set..... both walls are 9mm thick, i have 3mm i can use the rest is cut out....

#15 Preee

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Posted 12 January 2013 - 10:21 PM

Good question , i'm sure if they were worn to 3mm they would fail MOT

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