Thought this E28 brake upgrade thread might be of use!

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BUELLRIDER
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Post by BUELLRIDER »

Yes thats the 1 that was on my car the 1 on the left. I will check it , but I am putting the 1s from the e34 on when it goes back together.
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Post by BUELLRIDER »

The rotor shields on my e12 have air holes in them . the e28 1s I have now are not vented at all. Should I drill some holes in them for venting ???
1981 635 German FRANKEN6ER gray market RIG, 1988 635,91 Nissan 240SX , 1993 Harley 1340ccFXR Super Glide, 2000 M2 Buell 1200cc.
celtic_ross

Post by celtic_ross »

If i am going with a set-up of e34 535 BRAKES & A E32 750 mc.
What model type should i get for the brake lines? e32, e34 or e24?
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Post by BUELLRIDER »

Good ? I need to make a steal line to my CALI now . There is 1 more line in the back on the e28 then my e12 had.
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cgswift
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E32 750iL Caliper Question

Post by cgswift »

James mentions in his article that he has previously fitted the E32 front calipers to his car. The M-Register article from September 1999, by Pete Read, also states that this application is possible. Once more, Bavarian Autosports blog from July 9th, 2010 also includes the E32 1X60 single piston front caliper as a viable option for upgrading the E28/E24 chassis.

My issue is that they just don"t fit! I have two sets of calipers from two different 1990 750iLs and the geometry is close, yet no go. Has anyone any experience that might lead me to a reason for my failure? Toph
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Brucey
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Post by Brucey »

I recently looked through all the E32 750i part numbers and it seems that there may be two different disc sizes. However it seemed that there was only one caliper, one mounting bracket, one upright, one pad type.... so the end result was confusion for me.

If you have the correct part numbers for the pieces that you are trying to use, or a description of the clash that you have, please let us know.

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cgswift
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Post by cgswift »

I appreciate the response Brucey! The issue that I'm experiencing is that the bolt centers for the original E24 caliper mounting bracket seems to be ~12.25 cm. The bolt centers for the E32 caliper mounting bracket are ~ 11.5cm. I'm having a difficult time wondering where I went wrong. As stated previously, the same information appears all over the web that this combination should work. The two pair of calipers that I have actually appear to be physically different, yet they are both Ate, and both sets came from 1990 750iL vehicles. They are dimensionally identical as far as critical mounting and function measurements. As far as an individual part numbers, I would have to rely upon the previously mentioned articles that allowed me to initiate this soup sandwich.
Toph
Last edited by cgswift on Sun Jun 26, 2011 3:28 am, edited 1 time in total.
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Brucey
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Post by Brucey »

well a set of calipers from a '98 model E38 definitely have a smaller mounting bolt centre dimension, but I'm not sure that it is exactly as you describe.

Is it possible that you got some calipers from an E38 and not an E32?

if so it may be that all you need are the correct mounting brackets and you are good to go.....

I would like to bottom this out too as I have (guess what) a set of E38 big brakes and am looking to find the correct mounting bracket to make it all work out OK- I think the sliding pin centres are common so the caliper bodies may work with other brackets, well that is what I'm hoping.....

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cgswift
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Post by cgswift »

Both sets of my calipers are guaranteed to be E32. I purchased one car for the donor components for my M70 swap. (If you would be so kind as to send me a 5/6 speed tranny and clutch components from Yirrup, they apparently don't exist here...) I took what I wanted and sent it to the breakers. As stated, the components were functionally identical. Dunno what's going to come of this. Either my past has finally caught up with me, or the information posted online was incorrect at its conception, and has been plagiarized multiple times. Toph
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cgswift
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Post by cgswift »

In reference to your comment about the mounting brackets/sliders, the E24 brackets will interchange with the E32 calipers. Unfortunately, they will not accept the E32 rotor width, and are visually shorter in appearance to accommodate the 20mm reduction in rotor diameter.
Chris Wright

Post by Chris Wright »

cgswift wrote:I appreciate the response Brucey! The issue that I'm experiencing is that the bolt centers for the original E24 caliper mounting bracket seems to be ~12.25 cm. The bolt centers for the E32 caliper mounting bracket are ~ 11.5cm. I'm having a difficult time wondering where I went wrong. As stated previously, the same information appears all over the web that this combination should work. The two pair of calipers that I have actually appear to be physically different, yet they are both Ate, and both sets came from 1990 750iL vehicles. They are dimensionally identical as far as critical mounting and function measurements. As far as an individual part numbers, I would have to rely upon the previously mentioned articles that allowed me to initiate this soup sandwich.
Toph
Did you figure this out?

This has been confusing to me also.

When you talk about the distance between bolt centers, are you talking about the distance between the slider bolts where the caliper mounts to the carrier or the distance between the carrier mounting holes that bolt to the 2 mounting ears on the strut?
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Brucey
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Post by Brucey »

its the carrier/strut bolt pattern, and no, I've not figured it out yet. Need to spend more time in the ETK...

I had another look the other day and the carrier appeared to be common between E32 750, 740, 735 and E34 540 models. So I'm still confused...

hey ho....

cheers
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Chris Wright

Post by Chris Wright »

Here is another brake up-grade post for the E34 with part numbers:
http://www.bmwe34.net/E34main/Upgrade/Brakes.htm

I was wondering if cgswift had figured it out? He must have the wrong part numbers somehow?

Here is a thread showing the E32 carrier bolted to Taylor's E24. It also shows the lager E32 disc fitting in the stock E24 dust shield/backer plate.
http://forums.bimmerforums.com/forum/sh ... ?t=1747404

Ireland Engineering is also selling a Big Brake Kit, using 750i/540 parts:
Ireland Big Brake Kit: http://www.nexternal.com/ireland/big-br ... -p843.aspx
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Re: Thought this E28 brake upgrade thread might be of use!

Post by tschultz »

I know I am years late on this but for E32 740i/750i brakes to work on the e24/e28 rear, one must install E34 540i/M5 brake rotors on the rear.
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