Click to go to Forum Home Click to go to maXbimmer Home

Go Back   maXbimmer Forums > maXimum Tech > 3 Series > E30 (1983 - 1991)
User Name

Welcome to!

You are currently viewing our boards as a guest which gives you limited access to view most discussions and access our other features. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!

Thread Tools Rate Thread Display Modes
Old 06-17-2009, 12:57 AM   #1
El Gato Liso
6th Gear Member
El Gato Liso's Avatar
Join Date: May 2007
Location: Brampton
Posts: 3,225
Slotted rotors question....

I had to give it second thought....but was way too unsure as i've seen both before.

and should i have the rear rotors go in the same direction as the front rotors?

A or B *front LEFT strut!!!*

R.I.P. E30
El Gato Liso is offline   Reply With Quote
Old 06-17-2009, 07:18 AM   #2
Quack's Avatar
Join Date: Jul 2002
Location: Toronto
Posts: 12,081
Send a message via MSN to Quack
it really depends on the manufacturer, I had slotted rotors on my 540 and when I was installing them there was a L & a R stamped on the rotor, after installing it looked like the pic "B", do you know the brand of rotor you bought?

Maxbimmer Drama, You Gotta Love It
Quack is offline   Reply With Quote
Old 06-17-2009, 08:08 AM   #3
Duct_Taper's Avatar
Join Date: Oct 2008
Location: Ottawa
Posts: 601
I would have thought A, assuming you're trying to get the brake dust/gases to go outwards towards the wheel and not inwards towards the hub.

Edit: And whichever way they go, the rears should be the same as the fronts.
Duct_Taper is offline   Reply With Quote
Old 06-17-2009, 08:51 AM   #4
2nd Gear Member
Join Date: Apr 2009
Location: Brantford
Posts: 69
look at pic b,as the wheel rotates the slots clean the surface of brake pads yes.
what would pic A do for yah?nothing slots would be on the wrong angle for rotation unless you drive backwards down the road
crossdrilled for the street good, slotted and crossdrill race application,you go thru a ton of pads. .Mister
There are two kinds of drivers out there.BMW drivers and all the !@#$% Rest. U want to catch a bimmer ,u better have a bimmer.
Mister is offline   Reply With Quote
Old 06-17-2009, 09:29 AM   #5
craz azn
6th Gear Member
craz azn's Avatar
Join Date: Feb 2004
Location: Port Perry
Posts: 7,631
Send a message via MSN to craz azn
It won't matter, as long as the rotor vents the proper way. At the rear it won't matter since the disc is solid anyways.

Rippin' Proper | Youtube | Vimeo |
craz azn is offline   Reply With Quote
Old 06-17-2009, 10:43 AM   #6
Still learning....
xlash's Avatar
Join Date: Apr 2009
Location: Center of the Universe
Posts: 641
It's A. As someone one said the setup in A would allow the brake dust, gases to move outwards.

Just my 0.02, slotted/cross drilled rotors really only add aesthetic value. These 2 have been grandfathered in from the olden days when mechanical engineering had to substitute for materials engineering. You want to maximize the area of contact between the brake pads and rotor and slotting and drilling reduces that. And what's worse is you actually increase brake dust by using slotted/cross drilled rotors, thus reducing the lifespan of the pads. I haven't experienced cross drilled rotors but I have heard that they start cracking faster than plain rotors as well.

If you want higher performance rotors go with vented rotors. They dissipate gases and heat a lot faster without hampering the life of the pads.
Selling: Winter Tires/Wheels for E36/E30
xlash is offline   Reply With Quote
Old 06-17-2009, 11:11 AM   #7
Quack's Avatar
Join Date: Jul 2002
Location: Toronto
Posts: 12,081
Send a message via MSN to Quack
the people that are guessing it's "A" you don't really know do you, I already said it's really depends on manufacturers, some have it likepic "A" & some like pic "B", I've installed many slotted rotors & they vary from manufacturer, look at DTM race cars, they have their rotors like pic "B".

Maxbimmer Drama, You Gotta Love It
Quack is offline   Reply With Quote
Old 06-17-2009, 02:36 PM   #8
Driving in the fast lane
slemmer's Avatar
Join Date: Dec 2002
Location: Missed in 'sauga
Posts: 2,983
I don't think they really make any appreciable difference on the street. Just like video cables - pay the $$$ for a 24 ct plated end or less for nickel plated. You'll still see the picture and probably won't know the difference unless someone told you. Plus, you'll needa scope to see any miniscule differences.

'15 Ford F150 Lariat SCSB 4x4
'04 645cic
'00 740i Sport
slemmer is offline   Reply With Quote
Old 06-22-2009, 02:42 PM   #9
7000 RPM
juzer's Avatar
Join Date: Mar 2009
Location: toronto
Posts: 198
install them like B photo and forget them
juzer is offline   Reply With Quote
Old 06-22-2009, 03:21 PM   #10
is BMW crazy
bmwm5lover's Avatar
Join Date: Sep 2002
Location: Thornhill
Posts: 15,579
Mine are installed like A.

The theory is that B gives it a bigger "Bite".
www.enthusiastauto.caNeed a car???

His--'00 BMW ///M5 .:Jet BLK/BLK:.Individual- Modded
Hers--'07 BMW M5/6.:Indianapolis Red/Black:.
'91 BMW 850i J Spec-ST Tuning Kit- Lowered-Wokke Chips- Custom Exhaust- 18" MK1's-KN Filters+ M Steering Wheel- Stereo Upgrade +++
'88 BMW 635CSi Lowered
'81 MB 500 SEC Koenig WILD RIDE
bmwm5lover is offline   Reply With Quote
Old 06-22-2009, 06:58 PM   #11
Join Date: Jun 2008
Location: Brampton
Posts: 713
Lol nice art
it wont matter
but if you want set them up like "a"
5thseries is offline   Reply With Quote

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump

All times are GMT -4. The time now is 12:43 PM.

Powered by vBulletin® Version 3.8.10
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Maxbimmer Copyright 2001 - 2018