Big brakes?

[amschnellsten]

Does anyone know if the lager Brembos from a 728 fit a US 740?

[E38750iL]

728i EU specs Brembos = 750i/il EU/US specs

Yes they should fit

[Edwin NL]

^^????

The rotors are a little smaller

[amschnellsten]

Edwin, is there an e38 that came with light large brakes over there?

[Edwin NL]

Ehhhhhhhhhhhhhhhhhh how can steel brakes be light :D

Not sure on your Q though

[Xephius]

Edwin, is there an e38 that came with light large brakes over there?

I think I know what you are talking about....

I looked at the 4 Pot "Brembo" brakes and the Protection package brakes back to back...

Neither will stop your car any faster.. But if you want something that looks cool and is "light weight" I would go for the 4 Pot Brembo set. They use a smaller rotor, but a larger pad, and the caliper itself looks cool. I don't know the weight, but it will probably be close to the same as the US stock brakes because of the rotor size reduction. It will be a real PITA to get pads and rotor replacements unless you can/will order form Europe.

[amschnellsten]

thanks Xephius! You understand what I was talking about. Stock is good then if I can not loose any weight.

[Edwin NL]

The rotors from the E31 should be the same although they have a other part number

[735]

>> I looked at the 4 Pot "Brembo" brakes and the Protection package brakes back to back...

These 728i brakes are garbage

The only OEM brakes that are rock solid and UNBELIEVABLE in comparison to original are...

E38 M54 V12 750IL brakes front AND rear
you'll need calipers, caliper brackets, rotors,
pads front are different
pads rear are same in 740i/750i

[Reed Hunt]

>> I looked at the 4 Pot "Brembo" brakes and the Protection package brakes back to back...

These 728i brakes are garbage

The only OEM brakes that are rock solid and UNBELIEVABLE in comparison to original are...

E38 M54 V12 750IL brakes front AND rear
you'll need calipers, caliper brackets, rotors,
pads front are different
pads rear are same in 740i/750i

E38 750 brakes are a direct swap onto E38 740 cars - I have done it plus added SS lines...Get them rebuilt (not very expensive) and painted black, and you are good to go...

I had the opportunity to get both front and rear but, since I don't track the car, I went only with the fronts - likely am not missing much in the way of braking power...750 rear rotors are vented, though, unlike our 740s...

(not sure what an M54 is...?)

[cody3]

I love to hear that bigger brakes will not stop your car any faster... makes me chuckle every time I hear it...

[shled]

I know right?
I just got done moving the dinan stage 2 brakes and suspension to my car. They are the same setup as Reed and same yours Cody. The fronts have larger and thicker rotors, much larger pads (twice the size if I had to guess) and the rear rotors are vented (same caliper and pads, bigger carrier).

So some believe the car just doesn't go as fast due to all that extra brake weight?
They don't work any better?
Really?

[Spitfire007]

i think it's really what type of adhesion to the road you're getting from your tires.

with bigger brakes, it DOES take LESS EFFORT from the DRIVER (i.e Pushing on the pedal), to get a snappier deceleration.

Otherwise, if you can lock them up with your original setup, then the bigger brakes just get you closer to locking them up faster with less effort.....

All that being said, have your guys seen the Brakes on the F01? Holy cow they're HUGE....I want those.

[shled]

That makes sense, if all you do is full-panic stops from 100-0.

It seems simplistic for real world driving.

Here are some thoughts previously posted elsewhere:
Heat capacity
Heat capacity is the amount of energy that can be absorbed by the disc before the temperature gets high enough to cause brake fade. The mass of the disc is proportional to the heat capacity. Therefore, a lighter disc will not allow as much energy to be absorbed as a heavy disc.

Solid vs Vented
Vented discs are hollow with internal vanes. This increases the surface area of the disc and allows air to cool the disc mass more effectively. A 10 lb. vented disc will cool more quickly than a 10 lb. solid disc. In many cases, a vented disc can weigh less than a solid disc and still provide more effective braking because of the cooling effects alone.

Curved vs straight vanes
The vanes inside vented discs provide structural integrity to the disc itself as well as cooling. There are several different styles of vanes:
Straight vanes are the most common because they are easy to manufacture. Curved vanes are common in higher performance cars as they promote cooling better than straight vanes.

Where does the air go?
For solid discs, all the air travels over the surface of the disc - the same surface as the brake pads.
For vented discs, a considerable amount of air flows through the interior. Because it's spinning so fast, it creates a vacuum and air is sucked into the center of the disc and forced out through the edges. The air follows the pattern of the internal vanes.

Drilled discs
A common misconception is that the purpose of drilled discs is to promote cooling. This couldn't be further from the truth. The real purpose is to reduce weight.
Drilling can allow brake dust and gases to escape, but with modern brake pads, this usually isn't a problem. Choosing a drilled disc for that purpose doesn't make a whole lot of sense.
Many performance cars like BMW, Porsche and Mercedes AMG come with drilled discs from the factory. For these cars, the drilling is mainly about looks, just like bright red calipers. When people do serious high-performance driving on a track day, they usually swap to regular plain discs.
Drilled discs generally wear out brake pads faster and produce much more brake dust as a result.
Drilled discs have a shorter service-life than plain discs and tend to develop stress fractures/cracks over their lifetime

Grooved Discs
Grooved discs keep the pad surface clean and allow any gasses to escape which improves performance. Not too many grooves though, you only need 6 or so, anymore and it is just for looks (e.g. cheese graters)
For street driving they may make a marginal improvement in initial brake "bite"
Grooved discs are great for shedding water and mud off the rotor surface as in Rally racing or wet-weather racing.
Grooved discs accelerate pad wear and produce more dust, like drilled discs. They also add noise and vibration into the system. For many these issues are annoying enough to not choose grooved discs, unless you do a lot of rallying!

Two-piece discs
Two piece discs have several advantages including lower weight while maintaining most of the heat capacity and better cooling by having a more open center section.
Two piece discs increase costs and generally a poor choice for street cars. For racing, they can be great!

Plain discs
Plain discs are the best choice for 99.9% of applications

Name brand vs non-name discs
Why pay double the money for a Brembo discs vs. cheapo's? You guessed it there is pretty much no benefit. Its all the same stuff. Spend your money on better brake pads!

Specialist Discs (carbon, carbon-ceramic, carbon-kevlar, etc.)
Some really expensive cars come with an option for fancy brake materials. These brakes are excellent for track days since they are relatively lightweight but can withstand extreme temperatures without brake fade. This provides a competitive advantage for racing.
For the street, it doesn't help much at all, and they squeal a lot and wear fast.

Having said all that, I'd take a set of these, if the rest of the car came attached. ;)
http://shled.smugmug.com/Cars/FM-Atlanta/IMG3109/1030996124_cXpuD-XL.jpg

[m3studio]

I know right?
I just got done moving the dinan stage 2 brakes and suspension to my car. They are the same setup as Reed and same yours Cody. The fronts have larger and thicker rotors, much larger pads (twice the size if I had to guess) and the rear rotors are vented (same caliper and pads, bigger carrier).

So some believe the car just doesn't go as fast due to all that extra brake weight?
They don't work any better?
Really?

Ya but big brakes means nothing without good tires.

[Bimmmer740iL]

We are talking about stopping a 4300lbs car with brakes from 4600lbs car. I doubt the difference will be day and night. That said, I still want the 750 brakes:D