New brakes - slot direction???

4.2 V8 40v Naturally Aspirated - 339bhp
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goose
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Location: Berkshire

New brakes - slot direction???

Post by goose » Thu Aug 11, 2011 9:11 am

i know there has been debate about this before... but i picked my car up last night and the new Mtec drilled and grooved disks have ben fitted with the slots "opposed" to the wheel direction.

on my previous cars i always had them fitted rotationally (i prefer this look!).. but i am told that this is the correct way, to "cut-in" the disk into the pad.

I've found a few discussions: http://www.pistonheads.com/gassing/topi ... 0&d=0&nmt=

and this on AP Racing: http://www.apracing.com/info/info.asp?s ... ication_41

Any thoughts????


goose
Current:
'08 Carbon Black BMW X5 3.0sd M Sport|Full white interior bulb kit|White LED Halos|De-badged
'72 Sunburst Yellow VW Karmann Ghia Coupe|1641cc|Engle 110 Cam|Weber 34 Carb|dropped spindles|Porsche 911 interior

Past:
'06 Phantom Black Pearl Audi B7 S4 - Milltek non res|BMC Panel|034 25mm RARB|SuperPro poly bushes|Apikol poly Snub|H&R Springs|H&R 10mm rear spacers|LCR Splitter|R8 caps|JCap|RS4 Pedals|EBC D/G disks & yellow pads|HEL brake lines|White sides/DRLs|De-tango'd

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goose
2nd Gear
Posts: 226
Joined: Thu Aug 26, 2010 12:46 pm
Location: Berkshire

Re: New brakes - slot direction???

Post by goose » Thu Aug 11, 2011 2:36 pm

a lot of googleing and i found this...

- If the supplier's instructions elude to the need to throw dirt/water/heat out and away from the disc then fit this way...

Image

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- If the instructions elude to having to have constant airflow to the grooves to aid cooling, then fit this way round...

Image


The decision will be made for you if the vanes betweens the disc faces are slanted, as you would need to follow suit. But if they are straight/flat then you can choose either of the above :audibash:

goose
Current:
'08 Carbon Black BMW X5 3.0sd M Sport|Full white interior bulb kit|White LED Halos|De-badged
'72 Sunburst Yellow VW Karmann Ghia Coupe|1641cc|Engle 110 Cam|Weber 34 Carb|dropped spindles|Porsche 911 interior

Past:
'06 Phantom Black Pearl Audi B7 S4 - Milltek non res|BMC Panel|034 25mm RARB|SuperPro poly bushes|Apikol poly Snub|H&R Springs|H&R 10mm rear spacers|LCR Splitter|R8 caps|JCap|RS4 Pedals|EBC D/G disks & yellow pads|HEL brake lines|White sides/DRLs|De-tango'd

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1781cc
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Re: New brakes - slot direction???

Post by 1781cc » Fri Aug 12, 2011 12:33 pm

from what I can work out, it looks like I have them on the right way? hmmm
Image

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