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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > Suspension | Chassis | Brakes > Zimmerman Two Piece Rotors?
View Poll Results: Zimmerman 2 Piece Rotors... Real or Not?
Legit - Save the money 1 25.00%
1 Piece - Savings but not as advertised 3 75.00%
F*** it, buy the real Genuine BMW parts. 0 0%
Voters: 4. You may not vote on this poll

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      10-07-2019, 01:38 AM   #23
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Last update on this thread.

FCP has updated thier website and neither the pictures or the description on these are listed as "2 piece". Appears it indeed was, too good to be true.

Ah well, I did OEM rotors and Akebono pads last week and it seems good though I am surprised at the perceived decrease in initial bite. I've had a few times now where I've been concerned about them not working as expected but a little more pressure and they bite down better. I will try re-bedding them in the next couple of days and see how it goes.
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      10-07-2019, 01:17 PM   #24
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Quote:
Originally Posted by McQueen2014 View Post
Last update on this thread.

FCP has updated thier website and neither the pictures or the description on these are listed as "2 piece". Appears it indeed was, too good to be true.

Ah well, I did OEM rotors and Akebono pads last week and it seems good though I am surprised at the perceived decrease in initial bite. I've had a few times now where I've been concerned about them not working as expected but a little more pressure and they bite down better. I will try re-bedding them in the next couple of days and see how it goes.
I don't know if anyone has noticed, but Brembo now has OEM style 2 piece rotors. They have plain and the slotted/dimpled style for both the 340mm and 370mm rotors. Although I didn't see the plain 370mm on their website; but their website is t to good either. I found them for reasonable on Rockauto. They're supposed to be with all the major suppliers, but they don't appear to all have them yet. I just got a set of the plain 340 and haven't looked at them yet. I can take pictures later to verify them.
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      10-08-2019, 07:27 PM   #25
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So they Brembo rotors are indeed oem style 2 piece. They are the high carbon rotor (according to Brembo) with an aluminum hat.
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      10-09-2019, 10:49 PM   #26
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So they Brembo rotors are indeed oem style 2 piece. They are the high carbon rotor (according to Brembo) with an aluminum hat.
I am looking to get these as well. Which pads will you pair them with?
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      10-09-2019, 11:40 PM   #27
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Originally Posted by skier_du View Post
So they Brembo rotors are indeed oem style 2 piece. They are the high carbon rotor (according to Brembo) with an aluminum hat.
I am looking to get these as well. Which pads will you pair them with?
I'm using the Hawk HPS 5.0. Really like this pad as a street pad. They are nicely progressive. There's an instant bite from them with even a light press on the brakes, even when cold. But they're never grabby. Torque does seem to go up with a little heat. But hot or cold, I don't need nearly as much pedal pressure to slow down as I did with previous pads. (Stock when I got the car, Cool Carbon, then those Powerstop z26 performance ceramic pads) They're also much less compressible. So the pedal is much more firm than previous, which I also like. There's some dust, but not bad. I put about 800 miles on them and the wheels are just slightly darker grey, not dark like some performance pads do after some miles. Though I'm sure they will be if left long enough without cleaning the wheels. I just tend to not go that long.
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      10-10-2019, 12:39 AM   #28
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Quote:
Originally Posted by McQueen2014 View Post
Last update on this thread.

FCP has updated thier website and neither the pictures or the description on these are listed as "2 piece". Appears it indeed was, too good to be true.

Ah well, I did OEM rotors and Akebono pads last week and it seems good though I am surprised at the perceived decrease in initial bite. I've had a few times now where I've been concerned about them not working as expected but a little more pressure and they bite down better. I will try re-bedding them in the next couple of days and see how it goes.
Akebono are ceramic which have poor initial bite because they need to heat up to work. Hawk 5.0 pads have great bite.
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      10-10-2019, 01:03 AM   #29
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Quote:
Originally Posted by johnung View Post
Quote:
Originally Posted by McQueen2014 View Post
Last update on this thread.

FCP has updated thier website and neither the pictures or the description on these are listed as "2 piece". Appears it indeed was, too good to be true.

Ah well, I did OEM rotors and Akebono pads last week and it seems good though I am surprised at the perceived decrease in initial bite. I've had a few times now where I've been concerned about them not working as expected but a little more pressure and they bite down better. I will try re-bedding them in the next couple of days and see how it goes.
Akebono are ceramic which have poor initial bite because they need to heat up to work. Hawk 5.0 pads have great bite.
Much of this thread is about two-piece rotors that are solidly attached. There is one actual floating 2-piece rotor in the stock size 370x30. Made by StopTech and special order. I got them in drilled with the anti-rust coating and the bite with Hawk 5.0 pads is amazing. The initial gold coating wears immediately off the swept surface but remains inside the holes and vanes. See photos.

Tried to attach photos but this Bimmerpost phone app is still buggy and won't attach the photos. Sorry!
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      10-10-2019, 12:08 PM   #30
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Quote:
Originally Posted by johnung View Post
Quote:
Originally Posted by johnung View Post
Quote:
Originally Posted by McQueen2014 View Post
Last update on this thread.

FCP has updated thier website and neither the pictures or the description on these are listed as "2 piece". Appears it indeed was, too good to be true.

Ah well, I did OEM rotors and Akebono pads last week and it seems good though I am surprised at the perceived decrease in initial bite. I've had a few times now where I've been concerned about them not working as expected but a little more pressure and they bite down better. I will try re-bedding them in the next couple of days and see how it goes.
Akebono are ceramic which have poor initial bite because they need to heat up to work. Hawk 5.0 pads have great bite.
Much of this thread is about two-piece rotors that are solidly attached. There is one actual floating 2-piece rotor in the stock size 370x30. Made by StopTech and special order. I got them in drilled with the anti-rust coating and the bite with Hawk 5.0 pads is amazing. The initial gold coating wears immediately off the swept surface but remains inside the holes and vanes. See photos.

Tried to attach photos but this Bimmerpost phone app is still buggy and won't attach the photos. Sorry!
At least I know it's not just me that's having the issues with the app. Lol
I think you're talking about the Stoptech Aerorotors. They look like they'd be nice rotors for the money.
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      10-10-2019, 12:27 PM   #31
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Quote:
Originally Posted by skier_du View Post
At least I know it's not just me that's having the issues with the app. Lol
I think you're talking about the Stoptech Aerorotors. They look like they'd be nice rotors for the money.
They are nice. Hold up well to track work too. Replacement rings are basically the same price as whole rotors though... The cost savings is negligible (maybe $30).
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      10-10-2019, 01:36 PM   #32
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ECS makes a semifloating 2piece rotor in both 340 and 370 x 30mm.
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      10-10-2019, 02:07 PM   #33
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Quote:
Originally Posted by skier_du View Post
Quote:
Originally Posted by johnung View Post
Quote:
Originally Posted by johnung View Post
Quote:
Originally Posted by McQueen2014 View Post
Last update on this thread.

FCP has updated thier website and neither the pictures or the description on these are listed as "2 piece". Appears it indeed was, too good to be true.

Ah well, I did OEM rotors and Akebono pads last week and it seems good though I am surprised at the perceived decrease in initial bite. I've had a few times now where I've been concerned about them not working as expected but a little more pressure and they bite down better. I will try re-bedding them in the next couple of days and see how it goes.
Akebono are ceramic which have poor initial bite because they need to heat up to work. Hawk 5.0 pads have great bite.
Much of this thread is about two-piece rotors that are solidly attached. There is one actual floating 2-piece rotor in the stock size 370x30. Made by StopTech and special order. I got them in drilled with the anti-rust coating and the bite with Hawk 5.0 pads is amazing. The initial gold coating wears immediately off the swept surface but remains inside the holes and vanes. See photos.

Tried to attach photos but this Bimmerpost phone app is still buggy and won't attach the photos. Sorry!
At least I know it's not just me that's having the issues with the app. Lol
I think you're talking about the Stoptech Aerorotors. They look like they'd be nice rotors for the money.
Yes, I wish I could attach photos. They look similar to the drilled rotors in Brembo Big Brake Kits that use >30mm rotors on fronts and 28mm on rears. I think StopTech uses that aerorotor brand name for more than the floating 2-piece though so you have to make sure you're looking at the floating ones. I had difficulty finding a good price and finally ended up getting them through X-PH.

I chose the drilled rotors since I was looking for the best street performance. These drilled rotors along with the Michelin Pilot Sport 4S tires make driving in the rain seem like dry road. If I was really looking to track the car I would have considered the slotted rotors.

I had the same Hawk 5.0 pads on plain rotors prior to this change so these rotors are definitely the difference in the braking improvement , and I was really very happy with the braking before. This just takes it to another level.
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      10-10-2019, 03:25 PM   #34
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It looks like the Hawk 5.0's part number for the front brembo calipers is HB765, but there are 4/5 variations. Does anyone know which ones should be used for the grey calipers?
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      10-10-2019, 04:13 PM   #35
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Quote:
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It looks like the Hawk 5.0's part number for the front brembo calipers is HB765, but there are 4/5 variations. Does anyone know which ones should be used for the grey calipers?
It's the same pad for the blue caliper too. Any blue caliper, including m235i, M3/4 and so on. But for the front it's HB765B.664 and if you have the front grey calipers, you probably have the rear sliding calipers, which is HB624B.662 Hawk part number.
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      10-10-2019, 09:45 PM   #36
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Quote:
Originally Posted by skier_du View Post
It's the same pad for the blue caliper too. Any blue caliper, including m235i, M3/4 and so on. But for the front it's HB765B.664 and if you have the front grey calipers, you probably have the rear sliding calipers, which is HB624B.662 Hawk part number.
Thanks! Do they come with the brake sensors like the Akebono does?
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      10-11-2019, 08:06 AM   #37
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Quote:
Originally Posted by AK415 View Post
Quote:
Originally Posted by skier_du View Post
It's the same pad for the blue caliper too. Any blue caliper, including m235i, M3/4 and so on. But for the front it's HB765B.664 and if you have the front grey calipers, you probably have the rear sliding calipers, which is HB624B.662 Hawk part number.
Thanks! Do they come with the brake sensors like the Akebono does?
Hawk does not come with brake sensors. I feel like the akebono ones do that as a gimmick
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      10-11-2019, 07:20 PM   #38
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I have the mperformance bbk but it's essentially the same caliper as the stock blue sports brakes what I don't understand is how the pad makes contact with the extra 30mm of rotor space? The pads are the same size as the sport brakes and for that mater so are the m4 pads the same size? I'm confused
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      10-11-2019, 07:42 PM   #39
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I have the mperformance bbk but it's essentially the same caliper as the stock blue sports brakes what I don't understand is how the pad makes contact with the extra 30mm of rotor space? The pads are the same size as the sport brakes and for that mater so are the m4 pads the same size? I'm confused
Yes same caliper same pad size. The pads don't make contact with the entire face of the rotor on the 370 or 380mm rotors.
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