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      10-30-2008, 04:11 AM   #23
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That's not good. Whilst the dust seals melting is no safety issue, the cracked piston is a HUGE worry. If there is a single case of this occurring in a non-tracked car, I can feel a recall coming on! You just don't mess with brakes!
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      10-30-2008, 04:17 AM   #24
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RECALL ` ` ` maybe good for us. bad for someone hope buy a 135i in future.
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      10-30-2008, 06:40 AM   #25
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I'd like to thank the Original poster to this, in my opinion, a major issue.

I had the car on the hoist today and elected after reading that post to remove the pads and take a look, the photo you see is the one i took and emailed the owner, i have others but they are not as clear as the one posted. The Piston crack is a major issue to me and i am just glad we saw it as the car was to see a track tomorrow night, there are other cracks visible but the one you see is more than a crack, the piston has come apart and the section you see that looks like a crack actually fell out in my hands, this is dangerous stuff.

I'm not sure BMW will see it the way you guys are, who are calling for a recall, but we will see.

I am just so thankful we saw this now and not 'after' the .......

I hope to have some more information on this tomorrow when i hear back from BMW.
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      10-30-2008, 06:55 AM   #26
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now i think it is a real problem.
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      10-30-2008, 06:56 AM   #27
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Andrew,

Does it look heat affected? I just don't understand why a 3 month old caliper will fail like this, even thinking it affected by something like 400 degree C heat.
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      10-30-2008, 07:07 AM   #28
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the things similar about the OP and Way's car were aftermarket pads. Changing the aggregate frictional coefficient could have caused the failure in both instances. Or is that too simple or (inconvenient) an explanation?
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      10-30-2008, 07:16 AM   #29
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Taka, I have only done 4,000km too.

Prof, plenty of cars out there use track pads. Porsche guys use it day in day out. Same manufacturer too for the brakes (Brembo). I have never seen or heard anything like this EVER in my time with Porsches.
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      10-30-2008, 07:24 AM   #30
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I would rather thing track pads is the one that protects from heat, since they are usually made by material that dissipate heat better.

I think it is the stock pad when he tracks that makes a lot of heat cycles. The piston weaken and cracks over a short period of time.
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      10-30-2008, 07:28 AM   #31
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Quote:
Originally Posted by andrew@southernBM View Post
I'd like to thank the Original poster to this, in my opinion, a major issue.

I had the car on the hoist today and elected after reading that post to remove the pads and take a look, the photo you see is the one i took and emailed the owner, i have others but they are not as clear as the one posted. The Piston crack is a major issue to me and i am just glad we saw it as the car was to see a track tomorrow night, there are other cracks visible but the one you see is more than a crack, the piston has come apart and the section you see that looks like a crack actually fell out in my hands, this is dangerous stuff.

I'm not sure BMW will see it the way you guys are, who are calling for a recall, but we will see.

I am just so thankful we saw this now and not 'after' the .......

I hope to have some more information on this tomorrow when i hear back from BMW.
I completely agree. My car is with Andrew for prepping for the track day tomorrow, and this could really have been a bad result on the track, and I am not talking about my times either! So thanks Scott. Buy you a beer if you ever come to Australia. :thumbup:

Btw, my car is only a few months old and have done 4000km, of which there were 4 track days on it. This is rediculous, and if BMW/Brembo doesn't acknowledge the issue, I will be very dissapointed.
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      10-30-2008, 07:31 AM   #32
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wait a minute, if you have a denser pad and presumably not slots in the pads themselves to allow the gases to escape then by default you MUST be increasing the pressure on the pistons. someone explain this to me please.
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      10-30-2008, 08:00 AM   #33
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Hmmm not sure slot will cool the pad. Even slots on the disc will not give more heat dissipate quicker. The slot I was told by brake people is they sweep the excess dust from the caliper and make the braking better. ... :dunno:

I don't think it is a pressure problem and I doubt the braking force is that much... not that can crack metal on its own anyway. I think heat is more of a factor here prof.

I also think the stock wheel may not give a lot of cooling to it. I really dunno. I only found in my car when going from stock rim to a wider wheel base sports rim I have lower track temp... but I have AP racing caliper at the same time.... so dunno again.

But my theory on what happens to WAY is overheat over a period of time, crack after metal fatigue.
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      10-30-2008, 08:08 AM   #34
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Quote:
Originally Posted by takahashi View Post
Hmmm not sure slot will cool the pad. Even slots on the disc will not give more heat dissipate quicker. The slot I was told by brake people is they sweep the excess dust from the caliper and make the braking better. ... :dunno:

I don't think it is a pressure problem and I doubt the braking force is that much... not that can crack metal on its own anyway. I think heat is more of a factor here prof.

I also think the stock wheel may not give a lot of cooling to it. I really dunno. I only found in my car when going from stock rim to a wider wheel base sports rim I have lower track temp... but I have AP racing caliper at the same time.... so dunno again.

But my theory on what happens to WAY is overheat over a period of time, crack after metal fatigue.
OH I like AP racing?`I can't find any AP racing caliper for 135i what the part number is?? and will it work with the brake sonser??
any picture??

thanks
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      10-30-2008, 08:09 AM   #35
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Brilliant.....Tell me this news was not the equivalent of rain on your parade or someone pissing in your Wheaties?

We buy what should be a phenomenal car, and the bmw marketing hype even totes the awesome brakes on the 135. Now we find out they are garbage. Are these pistons aluminum...thus not able to endure high heat conditions and crack easily? Give me some tried and true binders from an e34 M5 or euro e36 M3.

Ahh..the joys of corporate cost cutting.

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      10-30-2008, 08:51 AM   #36
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This doesn't have immediate consequences for those of us who don't track regularly, but it sure bodes poorly for long-term reliability.
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      10-30-2008, 08:55 AM   #37
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Crap!! I know what I'm doing this weekend. Sorry to hear.
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      10-30-2008, 09:02 AM   #38
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I'm wondering if the BMW Performance brakes would do the same thing.
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      10-30-2008, 09:14 AM   #39
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Quote:
Originally Posted by larryn View Post
Crap!! I know what I'm doing this weekend. Sorry to hear.
Thank you!

Like what has been stated previously, this does not represent what I would expect from any Brembo product.
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      10-30-2008, 09:15 AM   #40
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Quote:
Originally Posted by mikeo View Post
I'm wondering if the BMW Performance brakes would do the same thing.
So do I.
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      10-30-2008, 09:18 AM   #41
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Quote:
Originally Posted by Mark M View Post
Brilliant.....Tell me this news was not the equivalent of rain on your parade or someone pissing in your Wheaties?

OT: gosh, never heard that vivid a simile before. brilliant.

BOT: taka, the theory i read says that the slot on the pad is to release excess gas pressure buildup for some denser pads. :iono:
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      10-30-2008, 09:23 AM   #42
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The 6 piston caliper suppose to disipate heat much faster than fewer piston and crack like this should not happen at all. It must be the material that they used is not strong enough to withstand the heat generated by the racing pad, but regardless, it should not crack like this at all.
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      10-30-2008, 09:25 AM   #43
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Quote:
Originally Posted by mikeo View Post
I'm wondering if the BMW Performance brakes would do the same thing.
Isn't it an identical design?
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      10-30-2008, 09:35 AM   #44
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Quote:
Originally Posted by emm3tt View Post
Isn't it an identical design?
That has been debated here, but no one seems to know if the materials used are the same or not.

Unless piston cracking is proven to happen with stock pads after track use (don't know why anyone serious about tracking would do that) BMW may claim the non-OE pads caused the failure and opt to not cover/recall.
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