BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i)
 





 

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      02-16-2016, 09:34 PM   #331
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Quote:
Originally Posted by Dynamic1 View Post
My 08 135i is at 92k miles and the rotors and pads were done (although the sensor still hadn't gone off)... so I took a look at my calipers and everything was in order. I'm all about some spirited driving (3 years in Germany to boot), and I'm surprised the original pads and rotors lasted this long. Sorry I didn't get more/better pics.
Spirited driving and track driving are quite different. Unless you're threshold braking corner after corner on the street, the heat generated is going to be a lot less.

The calipers on my car are about 30,000kms old and at least 60% of the dust boots are completely shot. The pistons themselves look in fine condition though. I'm using upgraded pads, ECS 2-piece rotors, Ti shims and no dust shields. In those 30,000kms over 3 years I've done maybe 10 or so circuit days.
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      02-17-2016, 06:01 AM   #332
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Right - I get that it's different... I saw somewhere in the thread a request for comparison to high milage calipers, so I was just sharing what I saw.
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      02-18-2016, 08:28 PM   #333
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Quote:
Originally Posted by Dynamic1 View Post
Right - I get that it's different... I saw somewhere in the thread a request for comparison to high milage calipers, so I was just sharing what I saw.
Ahhh ok.

Yeah I have an E88 135i with 148,000kms and the dust caps and pistons on those were fine. I've tracked it maybe 2-3 times but using stock brake pads but nothing like how I've tracked the E82. The E82 also has a lot more power and better pads so will generate a lot more heat.
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      07-09-2018, 05:04 AM   #334
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Backing plate for brake cooling

By way of comparison, this is what a race-specific cooling plate looks like. I run these on my Spec3 race car. Notice the flange is angled slightly towards front and that air is directed to center of hub/rotor to force flow into and through cooling veins.

http://www.bimmerworld.com/BrakeCool...es_E36__WM.jpg

Better yet, e82 specific part:

http://www.bimmerworld.com/E9X-E8X-N...ate-Right.html
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      06-21-2021, 05:14 PM   #335
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I bought an 08 135i with 88,000kms a month ago. Brakes became very noisy last few weeks. Pulled brakes apart to inspect/service- still had around 5mm pad front and rear. Came to find the caliper pistons are all badly corroded to the point they are crumbling apart. Have never seen this before on any vehicle ever. Been a technician for 10yrs. Any explanations?
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      06-21-2021, 06:45 PM   #336
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Quote:
Originally Posted by Fortugs View Post
I bought an 08 135i with 88,000kms a month ago. Brakes became very noisy last few weeks. Pulled brakes apart to inspect/service- still had around 5mm pad front and rear. Came to find the caliper pistons are all badly corroded to the point they are crumbling apart. Have never seen this before on any vehicle ever. Been a technician for 10yrs. Any explanations?
Possible the car was tracked? Those ceramic pistons are known to crumble under heavy load: https://www.1addicts.com/forums/showthread.php?t=221203

EDIT** Just noticed I linked back to this same thread... oops
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      06-22-2021, 03:56 PM   #337
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Quote:
Originally Posted by Fortugs View Post
I bought an 08 135i with 88,000kms a month ago. Brakes became very noisy last few weeks. Pulled brakes apart to inspect/service- still had around 5mm pad front and rear. Came to find the caliper pistons are all badly corroded to the point they are crumbling apart. Have never seen this before on any vehicle ever. Been a technician for 10yrs. Any explanations?
There are a couple different aluminum piston upgrades. The ceramic ones don't hold up to high heat, or so I'm told.
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      06-24-2021, 07:42 PM   #338
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Quote:
Originally Posted by Thunderguts View Post
There are a couple different aluminum piston upgrades. The ceramic ones don't hold up to high heat, or so I'm told.
This. The brakes are quite good and durable once shims and metal pistons are done. Remove the "ears" and switch to true 2pc floating rotors and they're not even that heavy.
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      06-25-2021, 08:04 AM   #339
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Quote:
Originally Posted by ShocknAwe View Post
This. The brakes are quite good and durable once shims and metal pistons are done. Remove the "ears" and switch to true 2pc floating rotors and they're not even that heavy.
Ears are f'ing 1.4 pounds per corner!
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      06-25-2021, 10:13 AM   #340
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Originally Posted by Suprgnat View Post
Ears are f'ing 1.4 pounds per corner!
Indeed. And serve no detectable purpose that I can feel.
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      06-25-2021, 10:19 AM   #341
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Quote:
Originally Posted by ShocknAwe View Post
Indeed. And serve no detectable purpose that I can feel.
Probably to mitigate brake squeal.
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      06-25-2021, 11:28 AM   #342
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Quote:
Originally Posted by Suprgnat View Post
Probably to mitigate brake squeal.
The horror
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      06-25-2021, 03:16 PM   #343
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Quote:
Originally Posted by ShocknAwe View Post
The horror
I know, right?

Brake harder and shorter and the brake squeal goes away, anyway.
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