New rear brake upgrade solution!
 

There have been threads here and there about using the 128i 300mm vented rotors on the rear and how this allows you to retain the e-brake. I did the math based on what measurements I had and it seems these rotors actually offer more swept area than the E36 M3 rotors. The problem for most people just comes down to the calipers and required adapter brackets, so a while back I asked a guy in Canada to make them and he finally did :

E36 318ti Big brake adapter kit - SRS concept - store
http://srs-concept.com/product/e36-3...e-adapter-kit/

Full disclosure, I have nothing to gain from this other than the brackets which I already bought and are on the way. But, I figured sharing this would make several of you happy.

Pretty cool, I'll keep it in mind.

Thanks! Picked up a pair to try. Now to source 128i calipers... :cool:

This may be my next upgrade if it works out for you.

Very nice. I've chatted with the owner of that company before. Nice guy and his products seem solid. I've used the caliper bushings they sell.

A question I have is what setup up
Front will retain a good F/R brake bias before pads?


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The calipers used with this set up have a 40mm piston. The E46 330 and the E36 M3 have 40mm pistons in the rear calipers. While there are other factors at play, the E36 M3 or the E46 330 front brakes would be a good compliment to this set up.

This looks like a great set up and I will likely use it on my track ti but I do wonder of the added weight and parts cost actually come with a benefit on a street car, especially with an E34 rear caliper upgrade.

New rear brake upgrade solution!
 

Thanks Ed! These will be for my track TI I have either 330ci or M3 fronts and boosters available for install. I do run the E34 rears on my current M44 TI for track use.


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Sourced a pair of rear 128i calipers this morning. It will get added to the Project list for the S52 when I upgrade the brake system for next season. :cool:

can anyone verify if the 15" wheel can fit over this? 300mm is cutting it close

Not likely. The 300mm front upgrade requires 16 inch wheels. I expect the 300mm rear set up would also have the same requirement.

Awsome!! Good to know.

=D

I'm not so sure 128i calipers will work. It says:

-2 rear calipers from:
BMW 325CI 2001-2006
BMW 325I 2001-2005
BMW 325XI 2001-2005
BMW 328CI 2000
BMW 328I 1999-2000
BMW Z4 2003-2008

I haven't put these on yet (not sure when I will have time), but I got the carriers from a 325XI at the local pick a part for $15. For calipers I went with E46 M3 because I was told they were apparently much more rigid, and because the pistons are a bit larger which should shift the bias more to the rear to balance out the M3 fronts. I may add in an adjustable proportioning valve so I can dial it in.

I thought so too, but then:
http://forum.e46fanatics.com/showthread.php?t=1024740

Looks like for the purpose of winter tires some e46 guys with a 2004 325i tried 15" wheels and needed spacers for the front but rear didn't have a problem.

According to RealOEM PN: 34216864056
http://www.realoem.com/bmw/enUS/part...&q=34216864056

That means we got : 294X19 Vented rear rotors that may fit under 15" :biggrin::biggrin:


Also that means that PN:/ 34116864058

http://www.realoem.com/bmw/enUS/part...&q=34116864058

300X22 Vented front rotors worked with 20mm spacers. :eek::eek:

Thoughts?

EDIT: Just checked and looks like he got the e36 m3 rear adapter too:
http://srs-concept.com/product/e36-3...e-adapter-kit/

Pretty sweet!

I would not call needing to add a 20mm spacer 'fitting'. I am also not sure it would actually clear, especially in the rear.

The cost of quality spacers and extended lugs or preferably a wheel stud conversion kit will more than negate any savings on tires (at least the first time around).

16 inch wheels are pretty inexpensive and so are 16 inch tires. That's the way to go if you're looking to upgrade the brakes to this rear set up and the 300mm front set up. Adding parts and spending money you don't need to to make 15 inch wheels sorta work would not be the path I chose.

True, always the voice of reason, so boring :tongue: , hahaha I just found it interesting that the rears fit for him.
Personally I just bought the m3 adapter for the rear, that way I can go with a factory bias with stock front and rear m3 brakes, and still only need to go 16" wheels.
Works for me. :biggrin: . . . . of course it will sit for a while as I gather other parts..*sigh*...

But! I'm looking at use in a rally car here in the states where the largest tire size is 15". However, the rally wheels are usually well clearanced for brakes. I've seen some examples of 300mm brakes fitting in other chassis. So there is a good chance it will work. Not the M3 with the 312, but the 128i.

Ah, thanks for the catch. I'll source the correct rears


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I just bought the rear 300mm vented rotors adapters! I will update when I eventually get them on.

update when you find out what offset you use to clear the 300mm rotors!

Bought the 300mm 128 adapters.

Used Z4 3.0si rear calipers and brackets. 128 300mm rotors did NOT fit for me. Ended up using smaller Z4 rotors.

First I was surprised , then looked at the SRS site again and for rotors it specifically mentions:

"-2 rotor from:
BMW 120I 2011
BMW 125I 2009-2012
BMW 128I 2008-2013"

Not the z4 rotor, for z4 it only mentions the caliper. :wink:

My adapters are still sitting until I need new tires, currently on 15" :confused:

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Sorry @ 95///m3!! Looks like I read your post wrong! Which smaller z4 rotors did you use? Just so others can also know.

Thanks!

I have my first track session in the ti tomorrow, but I already expect I'll be ordering these adaptors and upgrading the rears. Even during the pad bedding process I felt too much front bias (M3 front brakes/stock rear).

Am I correct that with the e82 rotors you get the parking brake, but with M3 rotors you do not?

Yes that is a correct assumption. I was pretty excited when I saw they offered the adapters to complete a full e36 m3 setup. I asked to confirm and it does seem like you loose your parking brake for the e36 m3 rear rotors/calipers. As my car is mostly a street car I opted for the non-M adapters in order to keep my parking brake.

Hi all,
Digging up an old thread here, but did anyone confirm if this kit fitted under 15"s? Just removed the abs out of the rallycar, and despite fitting a bias valve im struggling to get enough rear brakes. The gravel tyres i use are 15" so needing to find a solution that fits under ..
Thanks in advance

Sorry, I’m on 17s. I can confirm the kit installed and works perfectly.

To add some more info, I can conclusively say (and as already mentioned above) the 128 rotors do not fit as the rotor sits about 6mm too far inwards. If you still want to use the slightly larger rotor, you'll have to back mount the adapter pieces and get ~16mm spacers for them as well along with some shallow head hex bolts (interference with the caliper bracket).

I spoke with Simon (srs-concepts) about the issue and he concurs with the problem. See pictures for reference.https://uploads.tapatalk-cdn.com/201...a3ef3e27a3.jpghttps://uploads.tapatalk-cdn.com/201...6e651828c4.jpghttps://uploads.tapatalk-cdn.com/201...e02aa8d05a.jpghttps://uploads.tapatalk-cdn.com/201...d57d1b199a.jpg

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This ended up being my solution. I still need to get another caliper bracket because I shaved it down considerably trying to make it fit. But at some point it just became clear it wasn't going to work. I found some 20mm spacers and shaved them down to 18mm and the fit was perfect with the bracket swapped over to the back side.. You do need to remove most of the curved section of the backing plate for this as well.

Echoing what I said over a year ago. They don’t fit with the 128 rotors. I brought this to their attention with detailed photos and the solution last January. No one took the time or effort on their side to update the site or provide a solution. Meh

I bought mine when they first became available but didn't have a chance to mess with them until recently. In addition to the one car I have a second rear end and they wouldn't work on either. Simon was helpful and concerned, but I'm curious to hear if these really did work as intended for anyone out there. He seems to think there is more than one type of rear end. The part numbers don't seem to back that up, but obviously I can't prove that isn't the case.

When working with him about my ti, he sent me a set of thinner spacers intended for an e30 (so he says) and they still didn't work with the 128 rotors. He even proved to himself that the 128 rotors don't work as intended on the ti unless you mount the adapter as I have shown in the pictures above.

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He sent me a set of the thinner ones as well. No dice. I really think the spacer method is the only realistic way of making it work.

I'm on the same bus with you guys- my '98 (production day 12/98) needs a spacer as well (~16mm), which I am not that comfortable using for the demands of a track and autocross car.

Does anyone else out there have anything that will work to get one of the vented rotors and better rear calipers to fit? (I'm also running the 330ci front calipers and rotors)

I spoke to Simon a bit about this and he said a CNC option is in the works, but couldn't give me a time-table on it. It sounds like it will be like our solution with the spacers, but machined as one piece.

JDL - I doubt that the spacer will be an issue even - it is the same thickness as the knuckles the stock calipers sit on. Go for it and don't look back.

If an update is available, can you please let us know here.


As for a working solution to what was provided. Use rotors from Z4 3.0si.

Were you able to use the existing adapter with or without the spacers for the Z4 rotors? And were you also using the Z4 calipers or the '01-'04 325i calipers?

No spacers. I used all Z4 as I had a parts car available to me at that time.

I'll check in with him and if I get any updates I'll post them up here.

Also, I have an extra pair of E46 calipers and carriers if anyone is looking for them. They're from a 2001 325i IIRC.

Oh cool- so before I start ordering parts, I can use the Z4 (3.0, '03-'08) rear rotors and calipers using the adapter the way that it was intended (no spacers)? And can you get the parking brake to work?

Thanks for the help!