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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      10-19-2011, 01:40 AM   #1
HP Autosport
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Racing Brake E8x 135i two-piece Front Rotors

Rotor Material: Racing Formula Alloyed Gray Iron & Heat treated
Machining: Open Slot
Surface: EDP Coating w/cross cut grinding on friction surface

Click here to learn how RB two-piece rotors are built differently than the competition.

Weight Comparison

One-piece (slightly used) 21.60 lbs.
RB Two-piece 15.00 lbs.
Weight Savings: 6.60 lbs.

Material:

Alloyed iron formula adds strength and heat resistance. Heat treating further improves rotor performance for a more uniform and stabilized microstructure.
Design:

Design:

*The cooling vanes are of a convergent nozzle design, which increases airflow and turbulence and makes discs cooler. (Illustration #1)

*The center-mount flanges for hat mounting to the rotor ring have several benefits. (Illustration #2)
It allows the ring to be used on either side of the vehicle simply by mounting the hat on either side of the ring (unidirectional).
The stress load transferred from the ring to the hat is balanced.
Air inlets are widely open to both inboard and outboard sides of the rotor. More air suctions and even temperature on both sides of the disc surface.
Heat transfer from the disc surfaces to the hat is even and minimized by increasing the flange length and the airflow around the flanges.
Mounting flanges are on both friction surfaces ultimately provides excellent heat balance.


*Exclusive full floating design with 10.9 grade alloyed hardware. Hardware is DACRO coated and crimp locking. DACRO is highly corrosion resistant and provides a film for easier movement between the hat and rotor ring as disc expands and contracts and the crimp design provides positive engagement without rattling or torque loss at temperature.

*338x28mm (13.1" X 1.1") - 2.0mm thicker than OE


Fasteners:

Self Locking - 2 Pieces
No springs, No glue, No clips!


Price per set $797.64

Sale Price $717.88

Order here:

http://www.hpashop.com/product.sc?pr...categoryId=243
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Last edited by HP Autosport; 02-23-2012 at 04:03 PM.
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      02-23-2012, 02:27 PM   #2
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Brake upgrade for your 135i!
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      02-23-2012, 04:59 PM   #3
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Quote:
Originally Posted by HP Autowerks View Post
Brake upgrade for your 135i!

Thanks for posting these upgraded rotors Harold. So these rotors are +2mm thicker... but I guess you have to "cut down" your new brake pads to have everything fit over the rotor? Or do you also sell special narrower brake pads to go along with these thicker rotors?
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      02-23-2012, 05:23 PM   #4
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i'm guessing 2mm isn't enough of a difference in thickness to cause any fitment issues.

are replacement rings available? how much? is there any indication that there will ever be a matching rear fitment?
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      02-23-2012, 05:32 PM   #5
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I wonder if 1M caliper's and rotors would be a straight bolt on a 135i ?
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      02-23-2012, 05:47 PM   #6
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Quote:
Originally Posted by fourtailpipes View Post
i'm guessing 2mm isn't enough of a difference in thickness to cause any fitment issues.

are replacement rings available? how much? is there any indication that there will ever be a matching rear fitment?
$656.46 for a pair of replacement rings.

No, not rear application at this time. You can contact RB for more details
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      02-24-2012, 02:28 PM   #7
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Quote:
Originally Posted by Dackelone View Post
I wonder if 1M caliper's and rotors would be a straight bolt on a 135i ?
it's not entirely unlikely, but afaik, the 1M uses the M3 knuckle, which is different from the 135 knuckle. that doesn't necessarily mean they won't fit though...
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      02-24-2012, 06:38 PM   #8
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Quote:
Originally Posted by fourtailpipes View Post
it's not entirely unlikely, but afaik, the 1M uses the M3 knuckle, which is different from the 135 knuckle. that doesn't necessarily mean they won't fit though...
We tested this back in 2008 during our M3 to 135i/335i suspension conversion.

No, the 1M/M3 calipers although the same dimension externally use a different size piston. More pedal travel will be required so it's not ideal.

In addition, in able to use the 1M/M3 size rotors you will need to use the 1M/M3 caliper brackets, which don't fit the 135/335i spindles at all. If it were that easy, we would have done such an upgrade on the the 335i to start off instead of a BBK.
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      03-07-2012, 11:28 PM   #9
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2 piece brake rotor

Better cooling!
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      12-30-2014, 11:46 AM   #10
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Thread revival time ...

I track my modded 135i a lot, and never completely got rid of brake fade on stock rotors + calipers + rubber lines + Motul RBF600 fluid, using a variety of brake pads. The best results I ever obtained were when I used fresh Project Mu Club Racer 09 pads. They had zero fade issues for several track days, but eventually crumbled and lost some heat dissipation due to thinning pad thickness.

I realize I need to work on cooling, or bringing cool air to the center of the rotors more efficiently. My wider wheels and 255/35R18 tires in the front aren't helping. Ive tried Hardbrakes 0.5mm Ti heat shields, BMW F30 "winged" dust shields, with no noticeable cooling effects. Also tried bending the shields some more.

Yesterday, in an effort to determine whether brake duct flexible piping could be fitted and routed from my front bumper vents to the center of my rotors, I lifted the car up and turned the steering from left to right. There is absolutely no room in there without pinching and severing the flexible tube.

Stock 135i caliper seals and pistons also need to be refreshed.

Im thinking about buying RB 2-piece rotors with caliper seal + piston rebuild kit + SS brake lines ...

or ...

an entry level BBK ...
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M-Sport 2011 135i w/6SPMT | 255/35+255/35 Dunlop Direzza ZII StarSpecs | Quaife 3.46 FD LSD | CDV delete | BMS Oil Tstat bypass | ER FMIC & CP | N54Tuning DP | Bilstein B8 & Swift Spec-R | GC Street Camber Plates | M3 control arms & guide rods & rear subframe bushings & transmission mounts | Cobb PTF Stg2 agressive custom tune | PFC 08 brake pads | Hardbrakes Ti Heat shields | Custom brake cooling ducts

Last edited by dcaron9999; 12-30-2014 at 01:23 PM.
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      12-30-2014, 12:31 PM   #11
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I personally think it's a no brainer to go from a 338x26mm solid disc to a 355x32mm(Stoptech) floating disc that is at least 4 lbs. lighter and provide much needed thermal mass and much better cooling. You will also get a 6 piston caliper that is a couple of pounds lighter than stock and take minutes to change pads and have a much wider selection of compounds.

Thread where stock and Stoptech are compared:


http://www.1addicts.com/forums/showp...0&postcount=36
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      01-09-2015, 03:06 PM   #12
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