Member Since: 29 Oct 2011
Location: Staffordshire
Posts: 511
Cross drilled discs rotation
Hi there, I have had some vented and cross drilled brake discs fitted. Stopping power is excellent BUT which direction should they be fitted in. Does the slot on the disc face the front or the rear
Front off side.
Rear off side
Originally both were in the direction of the rears, now due to a warranty issue of brake wobble I have had the fronts replaced, they have now been installed with the slot to the rear after discussion with my indi. Question, should I have the rears swapped over as well.
The Subaru in this picture has them set like my rear discs Discovery 4 3.0 HSE 2010 year. I like it a lot. Now with winch 😂
Last edited by charlietortoise on 19th Apr 2020 3:11 pm. Edited 3 times in total
19th Apr 2020 3:00 pm
gstuart
Member Since: 21 Oct 2016
Location: kent
Posts: 14146
Well I didn’t know that , every day Is a school day
Apologises as I know that’s not much help but was just intrigued
19th Apr 2020 3:07 pm
Kilovolt
Member Since: 29 Jun 2015
Location: South Derbyshire
Posts: 1072
My AP Racing discs are mounted this way.
Outer edge reaching the brake pad first.
A very simple way to understand the drawing.
Hope that helps.
Cheers "Track day running - Don't put your foot back on the accelerator until your absolutely sure you don't have to take it off again"
Current Ride: D4 XS Commercial Baltic Blue SDV6 fully loaded with heated everything
Track Days: BMW E36 M3 Evolution MY 1996 (3.2 Litre 377 BHP sat in 1,250 Kgs of car, with a pro safety cage and some serious braking power)
19th Apr 2020 3:54 pm
gstuart
Member Since: 21 Oct 2016
Location: kent
Posts: 14146
19th Apr 2020 3:56 pm
charlietortoise
Member Since: 29 Oct 2011
Location: Staffordshire
Posts: 511
Cheers
Spooky, thats the way they were fitted first time around. Thanks.Discovery 4 3.0 HSE 2010 year. I like it a lot. Now with winch 😂
19th Apr 2020 3:59 pm
Stevepd
Member Since: 06 Mar 2018
Location: Wiltshire
Posts: 392
Great video and link . Everyday can be a school day visiting from www.rrsport.co.uk
20th Apr 2020 6:33 am
M3bobby
Member Since: 21 May 2018
Location: Sleaford, LINCS.
Posts: 857
I always thought they were mounted so that the grooves through the dust outwards so the opposite of the AP diagram.012MY RRS 5.0 Supercharged Autobiography (Current)
Mods:
TPMS (Complete but got an issue)
Genuine LR DRLs (Complete)
Remote Boot close from key fob (Complete)
2016 Discovery 4 Mirrors AKA RRS2 (Complete)
2014 L405 Surround Camera retro fit (Now 2016 L319)
2013 RRS Dual View Screen fit (Complete)
2016 LR4 RSE (Complete)
2014 LR4 Homelink (Complete)
2016 FFRR Electrochromatic Wing Mirror Glass (Complete)
20th Apr 2020 7:28 am
nigethecat
Member Since: 11 Sep 2016
Location: Marnoch
Posts: 4247
Agreed, I think everyone who fits brakes should watch/read this... so simple yet so important.... with Porsche I would think the the big “L” & “R” on the discs would help but obviously not I want to see the sweets before I get into your windowless van... I'm not stupid!
Corris Grey D4 Commercial SE 2016
Zermatt Sliver 2007 D3 SE manual (gone)
Indus Silver D4 HSE 2015 (gone)
Bonatti Grey D3 HSE 2006 (gone)
White D3 S (LHD) 2007 (gone)
Firenze Red D4 HSE 2014 (gone)
Black RRS 3.6TDV8 2008 (gone)
Rusty Green Defender 110 1997 (gone)
Black FL2 HSE 2013 (gone)
20th Apr 2020 7:28 am
M3bobby
Member Since: 21 May 2018
Location: Sleaford, LINCS.
Posts: 857
I’ve just read an article that states you can have the groove leaning forward or backward so shouldn’t be used as the deciding factor of which side the disc is fitted. Any direction cooling vanes are the deciding g factor and should lean rearwards. If the vanes are straight then the direction of the groove is personal choice.
https://www.zeckhausen.com/catalog/index.php?cPath=6446_6515012MY RRS 5.0 Supercharged Autobiography (Current)
Mods:
TPMS (Complete but got an issue)
Genuine LR DRLs (Complete)
Remote Boot close from key fob (Complete)
2016 Discovery 4 Mirrors AKA RRS2 (Complete)
2014 L405 Surround Camera retro fit (Now 2016 L319)
2013 RRS Dual View Screen fit (Complete)
2016 LR4 RSE (Complete)
2014 LR4 Homelink (Complete)
2016 FFRR Electrochromatic Wing Mirror Glass (Complete)
20th Apr 2020 8:06 am
Disco_Mikey
Member Since: 29 May 2007
Location: Dundee, Scotland
Posts: 20844
M3bobby wrote:
I always thought they were mounted so that the grooves through the dust outwards so the opposite of the AP diagram.
Thats how I fitted mine. Dust gets drawn away from the hub, and towards the outside of the disc, where it can be dispersed
I read that fitting them facing forward promoted the chances of brake squeal...My D3 Build Thread
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