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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Suspension | Brakes | Chassis > Z435is rotors, F30 backing plates, StopTech pads



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      09-15-2013, 12:52 AM   #1
rwalker
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Z435is rotors, F30 backing plates, StopTech pads

I've had trouble keeping my stock pads and rotors happy in my daily commute/romp in my 2010 E90 335i.

No real failing of the stock bits, it's just that my daily commute includes a run up to 120+ followed by a rapid downhill haul-down to 70 or so. Under these conditions, I've experienced a pronounced judder/moan/steering wobble that largely cures itself on cool down. Well, until the next day that is. BMW (and my dealer) have been very forgiving/generous. They've replaced my pads and rotors twice since new, only 19k miles ago...

My own attempt at a fix is F30 backing plates, Z435is rotors, and (while I'm at it) StopTech Street Performance pads.

The F30 backing plates have an air scoop that improves cooling air flow to the rotors. I have to admit it wasn't my idea: the E82 guys have been doing the same mod for years. The F30 bits mostly bolt right up. The top and bottom mounting points are identical to the E90. To properly secure the F30 plates to our spindles you need only drill one extra hole, which I templated by using the stock backing plates.

I won't get to try my romp until the 23rd, and I have a track day on the 27th. I'll keep this thread updated with how I've fared.

Pics attached.
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Last edited by rwalker; 09-15-2013 at 04:08 PM..
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      09-15-2013, 11:36 AM   #2
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Quote:
Originally Posted by rwalker View Post
The F30 backing plates have an air scoop that improves cooling air flow to the rotors.

Pics to follow.
Interesting! I am very curious to see the difference between the F30 and the E90 parts. When you say "backing plates" are you talking about the splash guards/dust shields for the rotors?

I've been thinking of removing mine for track purposes.
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      09-15-2013, 11:49 AM   #3
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Very interested in your impressions as I'm considering this combo of pad and rotor. Where did you purchase them from?
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      09-15-2013, 01:23 PM   #4
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Quote:
Originally Posted by vasillalov View Post
Interesting! I am very curious to see the difference between the F30 and the E90 parts. When you say "backing plates" are you talking about the splash guards/dust shields for the rotors?
Yep, exactly.
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      09-15-2013, 01:24 PM   #5
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Quote:
Originally Posted by sickem View Post
Very interested in your impressions as I'm considering this combo of pad and rotor. Where did you purchase them from?
Pads from mod bargains, rotors from dealer.
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      09-15-2013, 02:11 PM   #6
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I've cracked my stock pads twice. First time caused grooves in the rotors. Dealership replaced them the first time. The second time I went to Stoptech pads and rotors and I've had zero issues since. Even several spirited drives up and down Tail of the Dragon earlier this year.
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      09-15-2013, 02:43 PM   #7
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Quote:
Originally Posted by rwalker View Post
Pads from mod bargains, rotors from dealer.
Thx
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      09-17-2013, 11:35 PM   #8
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I like how no one questioned the "daily commute" with speeds of 120+ .
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      09-28-2013, 12:59 PM   #9
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This setup has fared well in my commute, though I've only been able to do the romp a few times since my last post.

No problems in my HPDE yesterday, either, though I did experience some fade after the 3rd or 4th hot lap.

The HPDE was held at Fontana's Auto Club Speedway. The LA chapter puts a chicane at the end of the front straight. The chicane requires you haul down from Vmax on the straight for a quick left right before heading into turn 1. In my case, I was braking from 140 down to around 90. In my experience, this would have really challenged the stock setup, but the new setup really impressed with its resilience.

Next time out, I might try more aggressive pads.
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      09-28-2013, 01:43 PM   #10
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Quote:
Originally Posted by rwalker View Post
This setup has fared well in my commute, though I've only been able to do the romp a few times since my last post.

No problems in my HPDE yesterday, either, though I did experience some fade after the 3rd or 4th hot lap.

The HPDE was held at Fontana's Auto Club Speedway. The LA chapter puts a chicane at the end of the front straight. The chicane requires you haul down from Vmax on the straight for a quick left right before heading into turn 1. In my case, I was braking from 140 down to around 90. In my experience, this would have really challenged the stock setup, but the new setup really impressed with its resilience.

Next time out, I might try more aggressive pads.
Keep us posted ...

I have been using z4 35is rotors and stock pads and have had zero issues at three HPDE events so far this year. I brake hard over a short period of time. Even when braking from 135 down to 60-70 there was no fade. My instructor was surprised as well.

I know that some guys are using PFC 08 pads with stock rotors without issues as well and claim even better braking performance.
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      09-28-2013, 09:47 PM   #11
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Part numbers on F30 backing plates? I'm interested as I will be doing my brakes in the next few weeks. are The F30 plates upgrades for both axles or just one?

-Justin
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      09-28-2013, 09:55 PM   #12
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I've only done the front.

Part numbers are 34116792237 and 34116792238, left and right, respectively.

http://www.penskeparts.com/DiagramsR...iagram=34_1949
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      09-29-2013, 09:27 AM   #13
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Anyone has part numbers for these z4 35i rotors? My dealer won't order them without one.
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      09-29-2013, 10:07 AM   #14
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Quote:
Originally Posted by dx1541 View Post
Anyone has part numbers for these z4 35i rotors? My dealer won't order them without one.
Mfg Part# 34116782593KT

http://www.ecstuning.com/BMW-E92-335...ors/ES2526447/
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      09-29-2013, 01:16 PM   #15
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Yeah: 34116782593

http://www.penskeparts.com/DiagramsR...iagram=34_1475
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      10-03-2013, 04:22 PM   #16
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The F30 dust shields look like a good upgrade for cooling, I may have to give those a try. I am using the Stoptech's on the track HPDE's as well and they held up pretty well, I was impressed. I want to try the Ferodo DS 2500 on the front next time.
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      10-29-2013, 10:31 PM   #17
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Good info. Looks like a good very cost-effective front brake upgrade. Just amazing they didn't design them this way in the first place...
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      10-29-2013, 10:41 PM   #18
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we're all learning
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      10-29-2013, 11:36 PM   #19
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Now, to figure out a way to shoot the cooling air from the brake air ducts around the wheel and right into that "scoop"...
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      05-05-2015, 12:15 AM   #20
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This doesn't work on a 2008 335xi

This doesn't work on a 2008 335xi.
Ask me how I know.
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      05-05-2015, 11:24 AM   #21
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sorry to hear that. which part didn't work? rotors, backing plates, or both?
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      05-05-2015, 05:10 PM   #22
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Quote:
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sorry to hear that. which part didn't work? rotors, backing plates, or both?
hopefully not the rotors, was planning to put those on mine when the current ones wear out
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