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      09-01-2015, 07:14 AM   #1
ketema
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Rear Brake Upgrade/Conversion Pros/Cons?

I have an opportunity to get some Porsche OEM Brembo rear calipers for a stupid good price. They are 4 piston (mine stock are 2 piston). The conversion kit is designed for an E46 M3 Details Here

Questions I have are
1) Will these fit a 2015 M235i (F22) ?
2) Even if they did fit is there any benefit ?

Thanks
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      09-01-2015, 09:04 AM   #2
Pparana
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Benefit:

Have to custom make a mount, try to find rotors that fit.

Pay Porsche consumable pricing.

Honestly the only benefit you will see is totally messing up the brake bias. Car will drive like a trailer brake dragging from the rear. You would also need to do the fronts to 6 pod to make the system work.

There are some kits out there with floating rotors 6 pod font 4 rear. But they are prob 4-5k. I cant see much of an advantage as the brakes on this car with race pads are great. Spend the money on track days driving.
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      09-01-2015, 09:16 AM   #3
ketema
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Thanks for the input. Needed to ask cause the price I was offered is phenomenal. Practically free. I had googled the brake bias to see what the effects were. Played enough gran turismo to guess there might be some effect. And without a bias controller i can see how it might be a pain.
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      09-01-2015, 09:19 AM   #4
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I'd take them for "almost free" then immediately list them on eBay.
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      09-01-2015, 09:23 AM   #5
ketema
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Quote:
Originally Posted by Alpine F31
I'd take them for "almost free" then immediately list them on eBay.
Nah. That defeats the spirit of the offer from a friend. They can sell to someone they would be useful to at normal price.
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      09-01-2015, 04:43 PM   #6
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Don't see why this would be worth a cent of your money to try to retrofit.

The rear brakes do very little work compared to the fronts, and the M already has very capable stoppers, which can be made more capable with a high temp fluid or more aggressive pad.

So other than filling out the wheel well with a mismatched caliper there is zero point to this.

If you are unhappy with your brake performance there are steps you can take, if you're trying to modify a complex piece of engineering based on a good deal from a friends leftover parts...then beware.
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