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2Addicts | BMW 2-Series forum Technical Topics N55 (M235i) Engine, Transmission, Exhaust, Tuning 6/4 pistons vs 4/2 Worth extra $$ ?

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      09-24-2014, 12:02 PM   #1
ketema
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6/4 pistons vs 4/2 Worth extra $$ ?

I am wondering what people's opinion are on the M performance brake package which are 4/2 F/R piston calipers Brembo Labeled with "M" vs the 6/4 F/R Brembo labeled kit that can be found online? The M performance fronts measure 370x30 mm in front and 345x34 in back. The Brembo GT kit measures 380x32 in front and 345x28 in back. Price is $2800 for full M Performance kit vs $4595 for the GT front plus $3695 for the GT rear kit. $8290 total. Is the braking power worth the price ?
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      09-24-2014, 12:11 PM   #2
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Quote:
Originally Posted by ketema View Post
I am wondering what people's opinion are on the M performance brake package which are 4/2 F/R piston calipers Brembo Labeled with "M" vs the 6/4 F/R Brembo labeled kit that can be found online? The M performance fronts measure 370x30 mm in front and 345x34 in back. The Brembo GT kit measures 380x32 in front and 345x28 in back. Price is $2800 for full M Performance kit vs $4595 for the GT front plus $3695 for the GT rear kit. $8290 total. Is the braking power worth the price ?
No one can answer this given what you've posted. Am I gonna slap an $8k ceramic brake kit on my grandma's Civic? Nope. Will I consider it on a dedicated track car? Yes. For my daily driver? Nope. If I had as much money as Trump and for some reason was an M235i owner who spent his days chatting on message boards? Perhaps.
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      09-24-2014, 12:41 PM   #3
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the M perf is basically the same brakes (on the M235) just slightly bigger rotors with dimples/slotted and different colors
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      09-24-2014, 12:41 PM   #4
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Quote:
Originally Posted by hyperzulu View Post
No one can answer this given what you've posted. Am I gonna slap an $8k ceramic brake kit on my grandma's Civic? Nope. Will I consider it on a dedicated track car? Yes. For my daily driver? Nope. If I had as much money as Trump and for some reason was an M235i owner who spent his days chatting on message boards? Perhaps.
So you have partially answered it. Is the car going to be used for the track more than the road: Yes. The trump comment makes no sense so I am ignoring it. I am seriously wanting to understand how the brakes differ. The GT kit is not carbon ceramic from what I can tell. So why would 2 pistons make that much of a price difference?
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      09-24-2014, 12:43 PM   #5
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Quote:
Originally Posted by hyperzulu View Post
No one can answer this given what you've posted. Am I gonna slap an $8k ceramic brake kit on my grandma's Civic? Nope. Will I consider it on a dedicated track car? Yes. For my daily driver? Nope. If I had as much money as Trump and for some reason was an M235i owner who spent his days chatting on message boards? Perhaps.
Haha love this, enough said.
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      09-24-2014, 12:45 PM   #6
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the M perf is basically the same brakes (on the M235) just slightly bigger rotors with dimples/slotted and different colors
The number of pistons in the caliper differ. How does that affect breaking performance? More surface area being held? Are two pistons worth the price difference? If they were carbon ceramic rotors I could see it, but from what I can tell the GT kit is not carbon ceramic.
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      09-24-2014, 12:48 PM   #7
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The number of pistons in the caliper differ. How does that affect breaking performance? More surface area being held? Are two pistons worth the price difference? If they were carbon ceramic rotors I could see it, but from what I can tell the GT kit is not carbon ceramic.
on the M235 the stock brakes have same pistons as the M perf kit...they are same brakes ...just different rotors...

the more pistons the less work a single pistons have to do
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      09-24-2014, 01:12 PM   #8
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Just to get things straight, as pikcachu said, the standard brakes on the M235 (blue calipers are standard with blank discs) are the same calipers you get on the M Performance option, just different colors. The discs themselves I haven't been able to verify that they are any larger in diameter, they do have dimples and slots which may help dissipate heat, but I doubt it will do much.

On the other hand, the Brembo kit is indeed an upgrade, but whether it is worth it is again hard to say. You do not have the car yet, I assume. I'm not a track junkie, but most that I know go through parts like crazy people. I would say the most prudent thing is to learn the car, its limits and shortcomings and go from there. Spending money for the sake of spending money is not really in my vocabulary.
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      09-24-2014, 01:18 PM   #9
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To reiterate you really need to learn the car first. I took my e92 out to the track a few times and quickly realized that the weight of the car far exceeded its braking capabilities on a track. They were good, but could really use help. But even with better pads, the weight was still too much for the tires and chassis. I could make it slightly better by getting better tires and coilovers, but the bigger problem was the weight. Brakes just help get the wheels from spinning... tires are what actually stop the car via friction. The biggest most heat dissipating brakes in the world aren't going to help any car stop on a wet road with slicks on doing 80mph any better than a crappy set of brakes. (huge hyperbole I know, but just making a point)
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      09-24-2014, 03:54 PM   #10
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Quote:
Originally Posted by ketema View Post
I am wondering what people's opinion are on the M performance brake package which are 4/2 F/R piston calipers Brembo Labeled with "M" vs the 6/4 F/R Brembo labeled kit that can be found online? The M performance fronts measure 370x30 mm in front and 345x34 in back. The Brembo GT kit measures 380x32 in front and 345x28 in back. Price is $2800 for full M Performance kit vs $4595 for the GT front plus $3695 for the GT rear kit. $8290 total. Is the braking power worth the price ?
The reason the brembo gt kit is so expensive is probably the rotors, do you have a link to the kit you are talking about? Brembo 2 piece rotors are expensive.

Last edited by boost82; 09-24-2014 at 03:59 PM..
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