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      07-16-2014, 11:10 AM   #1
3002 tii
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Z4 3.0si Rear Rotor - Cross Shopping Cheaper (E46) Options?

I'm shopping for new rear rotors for my Non-M. The specs are 294x19 and the OEM part number is: 34216794303

Tire Rack offers Brembo blanks at $73 each, but I noticed that the E46 325ci also uses the same sized rotors of 294x19. That OEM part number is 34216855154 (or 34216855156). Tire Rack offers Brembo Blanks for this application at $56 each.

Am I wrong to assume these rotors are interchangeable and I can just buy Brembo E46 ones, or is there more to diameter & thickness (ie offset perhaps)? Yes yes, diameter and thickness, that's what she said... let's just get out now LOL.
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      07-16-2014, 11:19 AM   #2
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I do believe the "hat" of the E46 rotor is quite a bit shallower than our Z4 pieces.
Good info here http://www.zpost.com/forums/showthread.php?t=751080
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      07-16-2014, 11:20 AM   #3
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If the PN is different it could indicate some subtleties that may result in a problematic fit. However it's impossible to know unless you get one to try out.

For example, the ebrake drum is/can be different while the size of the rotor is the same. Or the hub offset is different. But I also know the E89 rotor is a direct fit to the E9x but the part number is different, due to a 2 piece hub design to save weight.

So take that for what it's worth. I'd see if someone on the E46 board has taken off of their rear rotors and see if you can borrow it for a test fit before you buy.
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      07-16-2014, 11:45 AM   #4
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Thanks everyone

I'm now getting in the habit of bringing spare rotors/pads to the track. I failed Tech on day 3 of a long weekend at Watkins last month. Had to run around the paddock looking for someone willing to sell me ST40 pads lol. Fortunately I did find someone and pad swap on a BBK takes all but 5 mins lol =D
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      07-16-2014, 12:38 PM   #5
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I've been using the Centric parts (same mfr as Stoptech, just not slotted and/or drilled) with good results.

Cheap from Rockauto -- $48 each for the rears and $41 for the fronts
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      07-16-2014, 12:42 PM   #6
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Quote:
Originally Posted by Karacticus View Post
I've been using the Centric parts (same mfr as Stoptech, just not slotted and/or drilled) with good results.

Cheap from Rockauto -- $48 each for the rears and $41 for the fronts
For a while, I used the Advance Auto for the rears since I figured cheap blanks were just that but I did notice the Brembo ones lasted a little longer. Advance Auto is nice because they always have 30% off $xx + free s/h coupons so I was able to get rotors at $30 something a piece lol. But I'll check out RockAuto for sure...
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      07-16-2014, 12:47 PM   #7
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They've worked fine for me. Center (hat, such as it is) has a nice e-coat on it so it doesn't rust.

Next time I do the rotors on mine, I need to wire brush and hi-temp paint the hubs so they don't rust so much.
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      07-16-2014, 02:55 PM   #8
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I would say go for it.

Sssshhhhh, don't tell anyone, but i'm running e46 M3 rear brake rotors on my Z4M.

Same diameter, thickness, rotor depth etc. I probably picked up 3 or 4 pounds because the M3 rotors are one piece, while the Z4M rotors are 2 piece.

The BMW rotors are somewhere in the neighborhood of $350 for the set, Stoptech M3 rotors were about $140 for the set.
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      07-16-2014, 03:41 PM   #9
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5% off at Rockauto

http://grassrootsmotorsports.com/for...4/88806/page1/
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      07-16-2014, 06:35 PM   #10
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Quote:
Originally Posted by jdoublehcubed View Post
I would say go for it.

Sssshhhhh, don't tell anyone, but i'm running e46 M3 rear brake rotors on my Z4M.

Same diameter, thickness, rotor depth etc. I probably picked up 3 or 4 pounds because the M3 rotors are one piece, while the Z4M rotors are 2 piece.
3002 tii doesn't have a z4m but a regular z4. That has a different rear axle (and therefore different rotors).


On the brembo aftermarket site/catalogue there are technical drawings with measurements for all their bmw rotors so you can check it (and they won't fit):
http://bremboaftermarket.com/En/Car_...ue_Search.aspx
(check for the e46 325ci that is; brembo doesn't supply /m style rotors)
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      07-19-2014, 11:24 AM   #11
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Centric Parts has a fantastic parts information database. e46 325ci on the left z4 on the right. Notice the hat height.
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