2 Piece rear rotors! show some interest.

[chachacha28]

Originally Posted by pixelblue

If I hadn't replaced my pads 3 times already and hadn't seen how tight of a squeeze it was, I may have believed them too. Glad you guys will try out first

do you run shims in the back? how tight of a fit is it? i think theyre running 2mm wider for the 335i rears, and i havent been able to find any issues online.

If it would be an issue, i wonder if they could keep the stock width in the rear.

[BadM4]

id be down for a set of front and rears...i wasnt interested in just the fronts, i wanted the fronts and rears to match

[pixelblue]

I was Talking about the fronts. I'm presuming you're getting them. I know I couldn't get 1mm shims to fit. Which translates to 2mm gap

[Groundpilot]

Originally Posted by GaryS

David, have you had any overheating problems with your rear brakes? I've only had problems in front so far, but I haven't tried a really aggressive pad yet.

Gary, i dont really have ovrheating issues with my rear or front brakes. And i mostly track my car at watkins glen, that is known to be very hard on brakes. But i try not to run for more than 15-20 min sessions if its really hot.
PM me if you want to know my set up.

[chachacha28]

Originally Posted by pixelblue

I was Talking about the fronts. I'm presuming you're getting them. I know I couldn't get 1mm shims to fit. Which translates to 2mm gap

what kind of pads are you running? could that have something to do with it? im not trying to discredit anybody here, but there are a bunch of people running the shims (1mm each side = 2mm total) and they also have the stacked vented shimes (2mm each side = 4mm total). Im just trying to see exactly where the fitment issues are taking place.

If someone can run 4mm worth of shims, 2mm worth of shims, and 2mm worth of rotor shouldn't be an issue. Now if the rotor is .5mm thicker than advertised, or an aftermarket brake pad has .5mm more meat than a stock pad. I could see an issue with running shims and the rb rotors. but the thicker rotors without shims shouldnt be an issue at all. i did still want to run shims though, our calipers arent cheap.

anyone else running rb rotors wanna chime in? id like to hear from someone that installed brand new rotors with brand new pads.

thanks.

[pixelblue]

Most people run thicker shims with half worn pads. Can't account for possible variations but I had three different pads and they all were a tight squeeze when new. I remember RB saying something to the effect of possible filing may be required

[chachacha28]

Originally Posted by pixelblue

Most people run thicker shims with half worn pads. Can't account for possible variations but I had three different pads and they all were a tight squeeze when new. I remember RB saying something to the effect of possible filing may be required

that seems sketch to me. do they want you to file the friction material, or the backing plate? what do you think about that? you know a lot more about brakes than i do.

[GaryS]

Originally Posted by M3 09 AND135I 11

Gary, i dont really have ovrheating issues with my rear or front brakes. And i mostly track my car at watkins glen, that is known to be very hard on brakes. But i try not to run for more than 15-20 min sessions if its really hot.
PM me if you want to know my set up.

Thanks, I remember you had DTC70/60 with SRF. I'm pretty sure no one is having overheating problems with aggressive track pads in back like some people were having in front.

[Groundpilot]

Yes, i also have ti-shims,stop-tech aluminum pistons that made a huge difference when braking hard. Also, cut and bent brake dust shields deflect air towards rotors to cool them down.

[bogart]

Definitely interested.

[Focusedintntions]

The only thing i have with the rear rotors is they can be a pita to change. Getting the rear bracket off is annoying to do on a lift, let alone at the track on the ground. The front rotors are recommended for use only with track pads as the metal is so hard. If the rears are the same would you guys be planning on keeping them on all the time?

For the record i'd also be interested in these as I just ordered a set of the fronts

[e90pilot]

I'm interested too! (I just need a different hat so it fits on a 325i/328i). Here's my review on the fronts: http://www.e90post.com/forums/showthread.php?t=629483

[chachacha28]

Originally Posted by e90pilot

I'm interested too! (I just need a different hat so it fits on a 325i/328i). Here's my review on the fronts: http://www.e90post.com/forums/showthread.php?t=629483

I dont think they will make a hat just for you, you would have to get a few other people interested. they make hats for 335i's and 330i's, i dont know if yours is different or not. its gonna be tough because you are running hybrid brakes. I'd contact them directly, and see what they recommend for fitment.

I wont add you to the list yet, but if you find out they will work, post again, and i will add you.

[e90pilot]

Originally Posted by ezeedee

I dont think they will make a hat just for you, you would have to get a few other people interested. they make hats for 335i's and 330i's, i dont know if yours is different or not. its gonna be tough because you are running hybrid brakes. I'd contact them directly, and see what they recommend for fitment.

I wont add you to the list yet, but if you find out they will work, post again, and i will add you.

Actually the whole hat thing was RBs idea, but as you said they would need more people interested. They said mix and matching hats and rotors isn't all that difficult, but the cost can definitely put a damper on things.

The 135i braking system has the same master cylinder, booster and reservoir. I think even the lines are the same. The only thing that's in my way is the rear knuckle. The offset is different so the 135 rotor is too deep.

[chachacha28]

Originally Posted by e90pilot

Actually the whole hat thing was RBs idea, but as you said they would need more people interested. They said mix and matching hats and rotors isn't all that difficult, but the cost can definitely put a damper on things.

The 135i braking system has the same master cylinder, booster and reservoir. I think even the lines are the same. The only thing that's in my way is the rear knuckle. The offset is different so the 135 rotor is too deep.

If you can get a rotor that works on your car, maybe off a different 3 series, you should be able to order just the replacement rotor for the 135, and make it work fine.

[e90pilot]

It's funny you mention that. There are several people running 335 brakes on their 328 and the 335 and 135 share the same hat. They just need to upgrade the parking brake as well since the hat diameter is larger on the 135/335 than the 328.

[TT1351]

[QUOTE=ezeedee;11004642]http://forums.racingbrake.com/showth...ted=1#post3561 Post #50

- From racing brake on their forum.

Post in this thread or on their forum if you're interested.

http://www.racingbrake.com/135i_E82_...p/2166-381.htm - here is a link to the fronts.

Lets get some interest going!

People Interested:
1. Ezeedee
2. Xaeryan
3. Ducatist
4. M3 09 AND135I 11
5. Slo135
6. VegasJD
7. Focusedintntions
8. Bogart
9. tt1351

[Eyeman]

I'll definitely upgrade my rotors when I need to replace my stock rotors and this appears to be the best option that I've seen. Give me a year or two and I'm in..lol.

[JB135MDCT]

Sign me up.

[chachacha28]

bump for interest!

[chachacha28]

Ok, they want everyone thats interested to sign up on their forum and post there.

Ezeedee,

Thanks for rallying support for RB on the 1addicts forums. Warren is out of town for another week and he manages new product development and group buys. He will be able to respond when he gets back in town or if he logs in.

Our usual procedure is to run the group buy from our own forums rather than an external forum. When all of those interested folks commit by signing up at our forum, then we begin production on the rotor.

Stay tuned - you are still on our radar.

Mike

Please post up there if you've expressed interest here.

[chachacha28]

UPDATE:

Before we start this rear two piece rotor development I want you to know that the brake pad needs to be modified to fit the two piece rotor.

The maximum allowable rotor ring friction width, with a drum dia of 185mm and disc dia of 322mm, is 49mm for pad height, while OE is 53mm, so it requires to trim the pad height to match with the disc surface to avoid the overhung. The pad will be 4mmm narrower but still has a lot of friction material.

This is a similar modification like we did for M3 E46 rear two piece, and is the only way to make rear two piece rotor available.

We will make compatible brake pads available for these two piece rotors, but must disclose this deviation so that you are aware of it before committing to pre-orders.

If you can agree to this deviation, we will then release this item on web for you to order.

The estimated leadtime will be about 14-18 weeks from the time we receive 10 orders.

Thank you.

so you either have to modify your rear pads, or buy theirs. Once again, if you're interested, post up on their forum.

afraid i'm pulling out though, I don't want to be limited to one pad that fits.