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 The e23 745i and Turbocharged BMW Motor Topics
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 Rear calipers?
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Hit Man X
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Posted - Mar 03 2006 :  00:22:27  Show Profile  Send Hit Man X an AOL message  Send Hit Man X an ICQ Message  Click to see Hit Man X's MSN Messenger address  Send Hit Man X a Yahoo! Message  Reply with Quote
I was under the impression these vehicles had four piston calipers out back too? Was my memory bad?

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Four 745i! One '83 and three '85...I am a glutton for punishment.

Afshin-Switzerland
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Posted - Mar 03 2006 :  01:20:35  Show Profile  Reply with Quote
I think there're two at rear (4 only in front)...

Regards, Afshin.
1982 745i (5-Speed)


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Keith 85 H7s
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Posted - Mar 03 2006 :  09:11:42  Show Profile  Reply with Quote
Same rear brakes in the 745 as most of the other BMW from that era, one piston per caliper.
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345is
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Posted - Mar 03 2006 :  11:48:23   View 345is's Photo Gallery  Show Profile  Visit 345is's Homepage  Reply with Quote
Thats what I thought, I know all the other BMW`s are just one piston.

Dan Miller
Miller Performance
Miller Performance
Email: dan@millerperformancecars.com
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Afshin-Switzerland
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Posted - Mar 03 2006 :  13:51:42  Show Profile  Reply with Quote
Oh my bad... That's what I actually ment... Forsure it's a swimm type cliper... so there can be only 1 and nothing on the other side... [4]

Thx for correcting my miss-info guys [bb]

Regards, Afshin.
1982 745i (5-Speed)


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Hit Man X
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Posted - Mar 03 2006 :  18:08:02  Show Profile  Send Hit Man X an AOL message  Send Hit Man X an ICQ Message  Click to see Hit Man X's MSN Messenger address  Send Hit Man X a Yahoo! Message  Reply with Quote
Hrm okay! Can the 4 pots from the front bolt to the rears?

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Four 745i! One '83 and three '85...I am a glutton for punishment.
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Keith 85 H7s
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Posted - Mar 04 2006 :  08:46:51  Show Profile  Reply with Quote
The front calipers don't bolt to anything and nothing bolts to the front of these cars.

If you want rear brake upgrades, there are a bunch of places that these are discussed as most large BMWs have the same bolt pattern on the rear. Check www.m535i.org and look into the FAQ for the e28 and there is a section on the brake upgrades. Remember NOTHING fits the front of an e23 but all that stuff discussed for the rears will fit.
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Hit Man X
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Posted - Mar 05 2006 :  13:35:27  Show Profile  Send Hit Man X an AOL message  Send Hit Man X an ICQ Message  Click to see Hit Man X's MSN Messenger address  Send Hit Man X a Yahoo! Message  Reply with Quote
Odd how nothing is in common with the fronts.

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Four 745i! One '83 and three '85...I am a glutton for punishment.
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ra0507
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Posted - Mar 06 2006 :  15:07:08  Show Profile  Reply with Quote
The problem is that the rotors on these cars are tiny (and probably the weakest part of the car). When you look for replacements, there would have to be a different method of attaching them to the wheel or they would not clear the caliper. Someone on the site had purchased but not installed Brembos and I hope he/she will weigh in on this.

Rick
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scottie
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Posted - Mar 06 2006 :  18:00:01   View scottie's Photo Gallery  Show Profile  Visit scottie's Homepage  Send scottie an AOL message  Reply with Quote
We also discussed using a strut from an e32, but no one had an e32 strut to compare...

Another question, do all 7's come with the same brakes as 745i or is this a 745i only thing? Too lazy to check the etk.

Scottie Sharpe
San Jose CA
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James 84 745i
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Posted - Mar 06 2006 :  18:25:59  Show Profile  Send James 84 745i an AOL message  Reply with Quote
Yes, all 7s used the same front brakes. They also have, unfortunatly, the smallest front rotors on any BMW of the time except the 3 series... Oddly, they use the same rear brakes as the 5s and 6s (they also use the same trailing arms)

Early e23s have solid 2 pistion rear calipers, which are either the same or similar to early 6ers which use vented rear disks. The SA E23 uses a unique rear carrier and trailing arms but uses the old style brakes rather then the floating calipers. So if you wanted solid rear calipers you could find a SA rear suspension bolt that on, and bolt on some early 6er calipers and vented rotors... Of course all E28 rear upgrades work to and I looked into the E34 M5 brakes but that would make the rears larger then the fronts by 20mm...

As for the front, nothing yet.
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