Vented rear disk on an e36 compact?

[chrisbec]

Wow, so this thread has been running since October '06 and I still don't see a straight forward solution. I have a pair of Z3 trailing arms that I'm thinking about installing on my '95 ti for one reason only, it appears that they are more readily upgradeable than the ti brakes. Take a look at the upgrade kit available for the Z3 rear brakes (Bavarian Autosport Performance Brake Kit - Rear)

http://www.bavauto.com/assets/imglib...s_brakekit.jpg

Does anyone have an idea what equivalent parts are being used that make up this kit? I guess these could be M3 or ZM rear rotors (both same PN), not sure the diameter looks a bit smaller from the picture (the rear M rotors are 312x20mm and the stock Z3/ti rotor size is 272x10mm). Guess it is possible that they could have taken a larger diameter rotor and reduced the OD by turning it down by 20mm on a lathe. Does anyone know which calipers would just line up with the Z3 carriers and the M rotors (if that is what these are)? From the discription these are OEM BMW calipers, but I wonder what the application these are? My guess would be M3/ZM rear calipers with reduced OD rotors. Any ideas?

[ianik]

It seems almost straight fitment.

I think that with the brake shoe ( for parking only ) will work properly fitted like this ( 25mm on the TI vs 20mm on the Z4, so with 3mm sticking out it seems fine).

I 'm still stuck with the wrong calipers that I bought but found 2 piston calipers with 38mm pistons.

I will purchase the Z4 rotors tonight.

Let us know what is involved with yours 323i calipers.

[e36 323ti]

Originally Posted by ianik

Let us know what is involved with yours 323i calipers.

The 323i cab calipers is the calipers which I intended to use as described in the beginning of this (long) thread...

[bmvw]

What are the advantages conferred by slotted rotors. The brakes on the ti are damn good as it is.

[e36 323ti]

Originally Posted by bmvw

What are the advantages conferred by slotted rotors. The brakes on the ti are damn good as it is.

I think the discussion regarding slotted/non-slotted (and/or cross-drilled) deserve another thread. We are seaking a transformation from solid rear disk to vented rear disk. Slotted disks are not the same as vented disks...

I did not find my stock ti disks on my 323ti to match my requirements when participating on track day events. Maybe they are working better on the lighter 318ti...

[e36 323ti]

Originally Posted by chrisbec

Wow, so this thread has been running since October '06 and I still don't see a straight forward solution. I have a pair of Z3 trailing arms that I'm thinking about installing on my '95 ti for one reason only, it appears that they are more readily upgradeable than the ti brakes. Take a look at the upgrade kit available for the Z3 rear brakes (Bavarian Autosport Performance Brake Kit - Rear)

http://www.bavauto.com/assets/imglib...s_brakekit.jpg

Does anyone have an idea what equivalent parts are being used that make up this kit? I guess these could be M3 or ZM rear rotors (both same PN), not sure the diameter looks a bit smaller from the picture (the rear M rotors are 312x20mm and the stock Z3/ti rotor size is 272x10mm). Guess it is possible that they could have taken a larger diameter rotor and reduced the OD by turning it down by 20mm on a lathe. Does anyone know which calipers would just line up with the Z3 carriers and the M rotors (if that is what these are)? From the discription these are OEM BMW calipers, but I wonder what the application these are? My guess would be M3/ZM rear calipers with reduced OD rotors. Any ideas?

I would also like to know. I have sent them a mail...

[tiFreak]

the bavauto kit uses stock calipers, I don't think that it would have the M calipers unless it's for the Z3M

[e36 323ti]

Originally Posted by chrisbec

Take a look at the upgrade kit available for the Z3 rear brakes (Bavarian Autosport Performance Brake Kit - Rear)

http://www.bavauto.com/assets/imglib...s_brakekit.jpg

Does anyone have an idea what equivalent parts are being used that make up this kit?

According to the info given to me by Bavarian Autosport the z3 rear kit uses the same rotors and calipers as stock. Their rear rotors are however slotted and drilled, but no vented rotors... As I see it, the picture connected to the z3 rear kit must be seen as an illustration.

The project continues...

[chrisbec]

Thanks for the info on the Bavauto rotors. The picture they use is a little misleading.

Any updates for us?

I have an idea about how to correct the offset with the rotor to the e-brake shoes. What about switching the drive flange hub to that of a Z4? It should fit since the rear wheel bearing is the same for the ti and the Z4.

[chrisbec]

Interesting link for serious e30 upgrades including rear brakes I wanted to share with you guys. This is a German website, but there are excellent pictures. The work shown on this website is inspiring!

http://300mm.de/index.htm

[chrisbec]

Originally Posted by e36 323ti

Update:
Rear brake caliper from the e34 m5 3.6 (up til 10/89), which is made for 10mm solid disks and which has 38mm piston diameter, bolts stright onto the ti carrier. Perfect fit! Even the old brake lines can be re-used. No clearance issues, and no need for pad spacers.

I.e. new spec Rear:
272x10mm stock solid rotors
Calipers from e34 m5 3.6,
Goodridge steel braided hoses
PFC 01 pads

The rear brake calipers from the 1988–1992 e32 (735i) shares the same application as the e30 M3. These calipers have larger 38mm pistons and slide directly on to the ti carrier guide pins. Like the e34 M5 calipers the 735i (and possibly other e32's not sure) used 10mm thick solid rear disks. I bought a set of calipers on ebay for $36 and although they looked weathered, the pistons and bores were in pristine condition, no corrosion on the pistons at all. Also they fit good and it is a super easy cheap upgrade if you've already modified your front brakes! I just wanted to mention this since the e34 m5 3.6L specific calipers may be hard to find whereas the 735i's are probably a little easier to locate in the salvage yards . In the attached photo's the e32 caliper/piston is on the left and the stock ti caliper is on the right.

[e36 323ti]

Originally Posted by chrisbec

The rear brake calipers from the 1988–1992 e32 (735i) shares the same application as the e30 M3. These calipers have larger 38mm pistons and slide directly on to the ti carrier guide pins. Like the e34 M5 calipers the 735i (and possibly other e32's not sure) used 10mm thick solid rear disks. I bought a set of calipers on ebay for $36 and although they looked weathered, the pistons and bores were in pristine condition, no corrosion on the pistons at all. Also they fit good and it is a super easy cheap upgrade if you've already modified your front brakes! I just wanted to mention this since the e34 m5 3.6L specific calipers may be hard to find whereas the 735i's are probably a little easier to locate in the salvage yards . In the attached photo's the e32 caliper/piston is on the left and the stock ti caliper is on the right.

It sounds a bit more impressive saying that the calipers are from the e34 m5 3.6, doesn't it?

Other cars that uses the same calipers is (note Europe versions):

Usage (source http://bmwfans.info/parts/catalog/34211160381/ )

5' E34:
518i (M40)
518i (M43)
520i (M20)
520i (M50)
524td (M21)
525i (M20)
525i (M50)
525ix (M50)
525td (M51)
525tds (M51)
530i (M30)
530i (M60)
535i (M30)
M5 3.6 (S38)


7' E32:
730i (M30)
730i (M60)
730iL (M60)

[e36 323ti]

Originally Posted by chrisbec

Any updates for us?

I have an idea about how to correct the offset with the rotor to the e-brake shoes. What about switching the drive flange hub to that of a Z4? It should fit since the rear wheel bearing is the same for the ti and the Z4.

I am about to order Z4 brake shields and e-brake shoes (same as for non-ti e36 and e46) to see if they could fit and/or if the offset by that could be corrected.

Another option than the Z4-discs could be to simply modify a standard 'ti rear disc and fit e.g. an AP-Racing brake disc to it. Got the idea from this guy (http://www.lotusomega.no/brakes.shtml) which did it on a Lotus Omega.



It seems like the AP-Racing range of eg. 290mm, 295mm (CP3047) or the 300mm bolted discs will fit over the 171.3mm bell of the 'ti.

[diamondnik]

the possibility of using the e32 caliper is tempting, and according to some math it is what i need to balance out my 330ci front brakes.

BUT, i noticed 3 different part numbers for this e32 rear caliper.

the 735i which is same as e30 M3 is 34211160353
the one that is same as euro 7xx and 5xx is 34211160381
and the ones i saw on ebay that are only 735i/il are 34211155491

i'm scratching my head on this one... also i wonder if the 730/735 rear disc (300x10mm) would fit the ti rear hub?

[chrisbec]

Originally Posted by diamondnik

the possibility of using the e32 caliper is tempting, and according to some math it is what i need to balance out my 330ci front brakes.

BUT, i noticed 3 different part numbers for this e32 rear caliper.

the 735i which is same as e30 M3 is 34211160353
the one that is same as euro 7xx and 5xx is 34211160381
and the ones i saw on ebay that are only 735i/il are 34211155491

i'm scratching my head on this one... also i wonder if the 730/735 rear disc (300x10mm) would fit the ti rear hub?

If you trust RealOEM/bmw (which I do ~ 99%) then the ...353 &...491 are parts of the same assembly. The 353 number is for the complete caliper assembly (carrier, caliper housing and clip). The ...491 number is for the caliper housing only, which is a sub assembly of the ...353 number.
I'm not sure about the ...381 number, RealOEM doesn't recognize this part number.
You only need the ...491 caliper housing and use it with the carrier that is on your ti. This caliper will slide right onto the ti carrier guide pins.