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      11-27-2019, 04:05 AM   #133
Asbjorn
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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
Eracer76
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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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