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Brake upgrade e32/e34 for e24

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85MSteinway
Posts: 4
Joined: Wed Oct 09, 2019 2:25 pm
Location: Texas

Brake upgrade e32/e34 for e24

Post by 85MSteinway » Wed Oct 30, 2019 2:02 pm

I'm in the process of putting e32 front rotor/caliper and e34 rear rotor/caliper and e32 M/C for an e24 I bought for my wife. Parts are getting hard to find. I've had to order from 3 different vendors so far to get all the pieces I need for this job. I've meticulously gone through a lot of brake upgrade threads here and on other boards and pretty sure I'm ready to tackle this job.

I'm using these as reference:

http://bigcoupe.com/phpBB2/viewtopic.php?t=2137&
https://www.bimmerforums.com/forum/show ... pgrade-oem
http://www.bmwe34.net/E34main/Upgrade/Data/mbrake.pdf

The problem I'm having is on the front rotors. I havn't ordered the fronts yet because everything I have read said front rotor size for e32 is 302mmx28mm with single 60mm piston. These have been hard for me to source, and I do not have a core so they are expensive as well. The only place I can find that has e32 front rotors for sale is ECS Tuning and for e32/e34 front rotors they list the size as 308x28mm. I can't determine if this is just a rounding error of some sort, or just measuring from different parts of the rotor (total size vs usable area perhaps???)

Am I stressing over nothing and I should just order what ECS Tuning is listing as 308mm? Or is ECS listing the wrong part? These are the rotors I'm looking at: https://www.ecstuning.com/b-brembo-part ... 6756090kt/

It isn't just the Brembo rotors they list at 308mm either, they have the ATE, Genuine BMW, Meyle. These are all blank rotors. No slots/drills etc. The "performance" rotors they list for e34 do not have sizes listed for them. I don't want to buy drilled/slotted rotors unless that is all that will fit.

Can anyone shed some light on this discrepancy?


85MSteinway
Posts: 4
Joined: Wed Oct 09, 2019 2:25 pm
Location: Texas

Re: Brake upgrade e32/e34 for e24

Post by 85MSteinway » Wed Oct 30, 2019 9:37 pm

Thanks for those links. Much appreciated. I know turner didn’t have the calipers in stock and I didn’t check their rotors. But the other sources will be a good for parts going forward. Not sure why ECS is saying 308. Thanks again

cc_in_cc
Posts: 5
Joined: Tue Jul 01, 2014 10:52 pm
Location: Culver City, CA

Re: Brake upgrade e32/e34 for e24

Post by cc_in_cc » Fri Nov 01, 2019 1:51 am

I did a similar upgrade earlier this year and found everything I needed at rockauto.com
Chris
1989 BMW 635CSi
2009 VW Touareg
1974 Pinzgauer 710K

85MSteinway
Posts: 4
Joined: Wed Oct 09, 2019 2:25 pm
Location: Texas

Re: Brake upgrade e32/e34 for e24

Post by 85MSteinway » Fri Nov 01, 2019 1:48 pm

I spoke with ECS and they said it was an error and now their website shows the rotors as 302mm. Oh well, confusing, but I now have all my parts on order.

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