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      11-27-2019, 04:05 AM   #133
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Quote:
Originally Posted by engine killer View Post
Dear All,
I am wondering has anyone here ever installed a bigger bore brake master cylinder to their Z4 E89? The reason I am asking is that I am looking for a much firmer feel and shorter pedal travel.
I appreciate if anyone can shed me light on this.

Regards,
Elvis
I tried installing M3 brake cylinder on my 35i. Didn't fit.

For shorter pedal travel you want callipers with smaller pot area. EUR 35i is 5104mm2 (1x2552 really, but floating so 2x). As a general rule of thumb: Maintain the piston area sizing to +/-5%. Do not increase torque by increasing brake calliper piston area. Pedal travel will be long and spongy.

For firmer feel you want different brake pads with higher coefficient of friction and/or a better bed in. I have experienced the best bite with properly bedded in high friction semi-metallic pads. Currently using EBC yellow, and while they don't bite super hard, they are still better than oem pads in terms of feel.
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      12-24-2019, 09:11 AM   #134
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Have never changed calipers on a car but... on 2 of my cars that preceded my Z4 i ran the same simple setup to firm up my brakes:

Ferodo Racing DS2500 pads (Better bite )
HEL Braided Brake Lines (More direct pedal and braking force to caliper, no mushiness)
Motul RBF 660 racing brake fluid. ( Higher boiling point to take the heat from continous beating)

These 3 simple things are all you need to try as a first modification. after that if you still need more then feel free to go BBK etc.

Racing brake fluids are good but in my opinion they have a drawback... Longevity. They need to be changed more often. They take in moisture more easily and are not designed to have long service intervals in years like bmw has marked in idrive. I would change the fluid every spring even if street use only. Stock fluids seem to be better in that regard.
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      12-26-2019, 12:04 AM   #135
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Quote:
Originally Posted by KennyP View Post
Have never changed calipers on a car but... on 2 of my cars that preceded my Z4 i ran the same simple setup to firm up my brakes:

Ferodo Racing DS2500 pads (Better bite )
HEL Braided Brake Lines (More direct pedal and braking force to caliper, no mushiness)
Motul RBF 660 racing brake fluid. ( Higher boiling point to take the heat from continous beating)

These 3 simple things are all you need to try as a first modification. after that if you still need more then feel free to go BBK etc.

Racing brake fluids are good but in my opinion they have a drawback... Longevity. They need to be changed more often. They take in moisture more easily and are not designed to have long service intervals in years like bmw has marked in idrive. I would change the fluid every spring even if street use only. Stock fluids seem to be better in that regard.
I still believe it is a myth that upgraded brake lines improve braking feel. For daily driving, the brake feel is determined by the the pads and bed in imho. The better bite from the DS2500 also reduces mushiness, ie the amount you have to push the brake pedal. Ie it is the same thing.
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      12-26-2019, 10:01 PM   #136
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thanks for all the advice. the reason i want a super firm pedal feel is because my peugeot has a pedal box installed (brake servo deleted, one master cylinder for front and one for the rear) and it is very very firm/hard. i got used to it especially for spirit driving.

i now have the ap racing 6 pot installed. before the installation i was worrying the much increased total piston area will soften/worsen the pedal feel. i was wrong and it is just the opposite. the much stronger calipers don't flex so it gives a slightly firmer feel. also with the braided hoses, they won't expand so i believe it improves a bit too.

considering getting the ap racing 4 pot for the rear mating with the pb brakes' electronic line lock for the handbrake soon
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      02-18-2020, 06:28 PM   #137
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Has anyone successfully deleted the rear parking brake in favor of a different p&p caliper and rotor? I see its been asked many times before, but no one ever answered.
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      03-23-2020, 04:58 AM   #138
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Hello.

I managad to put up front M2/M4 380mm floating rotors(outer diameter corrected to 375mm), M2/m4 4piston calipers (big ones)

On the rear 34216763827

Brake disc, lightweight, ventilated

345X24
+ calipers from BMW 5 series (f10) 550 (4.4 twin turbo)

Caliper Type: TRW

Years: 2010 > 2017


In front made adapter plate spacers, 10mm.On the back adapter plates+cut new caliper bracket to fix it to adapter bracket.


Working exelent on Alps,no overheet,no vibrations,total confidence even if riding very agressive.

Last edited by Neg89; 03-23-2020 at 05:09 AM..
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      03-23-2020, 05:07 AM   #139
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Quote:
Originally Posted by Neg89 View Post
Hello.

I managad to put up front M2/M4 380mm floating rotors(auter diameter coŗected to 375mm), M2/m4 4piston calipers (big ones)

On the rear 34216763827

Brake disc, lightweight, ventilated

345X24 + calipers from BMW 5 series (f10) 550 (4.4 twin turbo)

Caliper Type: TRW

Years: 2010 > 2017


In front made adapter plate spacers, 10mm.On the back adapter plates+cut new caliper brakcet to fix it to bracket.


Working exelent on Alps,no overheet,no vibrations,total confidence even if riding very agressive.









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      03-23-2020, 10:40 AM   #140
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My brake kit showed up a few days ago...

The front is supposedly a direct bolt on, but the rear may need some work. I have an idea that I've seen done before, so hopefully I can make them work.

https://www.ecstuning.com/b-genuine-...o/34112450468/


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Last edited by Eracer76; 03-23-2020 at 10:49 AM..
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      04-16-2020, 07:26 PM   #141
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ERacer76,

I'm as excited to see your conversion as you are! Especially your results on the rear brakes. I bought a pair of calipers off of a 335i for the front (getting painted), but not sure if I should go with the rear ones that you have if they require some bracket fabrication. Good Luck & Godspeed !
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      05-02-2020, 12:33 AM   #142
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ERacer76 asked, "Has anyone successfully deleted the rear parking brake in favor of a different p&p caliper and rotor? I see its been asked many times before, but no one ever answered".

Please be the guy who answers this question! I'm so impressed with all of the mods you have done so far, yet this brake upgrade is the one that I can afford! Thanks, Joe
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      12-12-2020, 05:21 PM   #143
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estoril blue paint, hight temperature primer and clear coat.
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      12-19-2020, 10:46 PM   #144
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Quote:
Originally Posted by e89z4gt3 View Post
estoril blue paint, hight temperature primer and clear coat.
Very nice work, may I ask which front calipers disc size are you using & are they plug & play ?

Many thks & Merry Xmas
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      01-08-2021, 10:23 PM   #145
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Quote:
Originally Posted by sumotan View Post
Quote:
Originally Posted by e89z4gt3 View Post
estoril blue paint, hight temperature primer and clear coat.
Very nice work, may I ask which front calipers disc size are you using & are they plug & play ?

Many thks & Merry Xmas
340mm
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      01-09-2021, 02:50 AM   #146
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Wierd that all those BMW brake kits are smaller:

Like:
Yellow BMW Performance 325x25 disk
Blue M brakes 340mm disk
Z4 35is brakes 348x30mm disk

When i looked at these i didnt really see the point as i already have 348mm brakes. Shouldnt upgrade have bigger rotors? Around 360-380mm like in e92M3, M2 , even 340i M sport brakes are 370mm??

I do understand why there are these long brake upgrade threads on this forum. US spec 35i brakes probably dont cut it, especially when you can add 100hp to the car with a few simple parts. Like 2007 160kw 325i with tow pack has 330mm rotors at the front??

For US 35i owners. I saw ECS selling 35is 348mm front kit on their website for like 900 USD and same stuff but with drilled nicer discs, performance pads and stainless lines was like under 1300 usd.

Links:
https://www.ecstuning.com/b-assemble...4116773201kt1/

https://www.ecstuning.com/b-assemble...4116773201kt2/

To add to these: Find 35is rear 325mm brakes and swap out the 300mm ones.

Relatively cheap upgrade and actually bigger?
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      01-14-2021, 05:18 AM   #147
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Quote:
Originally Posted by KennyP View Post
Wierd that all those BMW brake kits are smaller:

Like:
Yellow BMW Performance 325x25 disk
Blue M brakes 340mm disk
Z4 35is brakes 348x30mm disk

When i looked at these i didnt really see the point as i already have 348mm brakes. Shouldnt upgrade have bigger rotors? Around 360-380mm like in e92M3, M2 , even 340i M sport brakes are 370mm??

I do understand why there are these long brake upgrade threads on this forum. US spec 35i brakes probably dont cut it, especially when you can add 100hp to the car with a few simple parts. Like 2007 160kw 325i with tow pack has 330mm rotors at the front??

For US 35i owners. I saw ECS selling 35is 348mm front kit on their website for like 900 USD and same stuff but with drilled nicer discs, performance pads and stainless lines was like under 1300 usd.

Links:
https://www.ecstuning.com/b-assemble...4116773201kt1/

https://www.ecstuning.com/b-assemble...4116773201kt2/

To add to these: Find 35is rear 325mm brakes and swap out the 300mm ones.

Relatively cheap upgrade and actually bigger?
Twin pistons should already make a world of diff against single piston.
I've been researching on upgrades as well. Biggest issue at hand is the DSC cause we don't know what's in the program. To me it's not about just putting BBK at the front it has to achieve a balance with the rears as well. Mine isn't a 35is hence have been hunting for 35is rear calipers for my next upgrade. I do think this M caliper BBK is a good choice.

Cheers
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      03-21-2021, 03:52 PM   #148
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If someone wants to know how tobput m4 brakes front and also keep the parking brake working and upgrade rear brakes PM.
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