The definitive guide to BMW Z4 E89 big brake kits

[B21]

Given the passage of time I thought I'd refresh /update /add to the options now available.

There are a number of options

Upgrade within known E89 family eg 35is rear brake on other models

BMW family upgrades eg using F series Brembo calipers

Non BMW family ugrades eg using Ford Mustang calipers

Custom designs from Alcon, Ceika, PB brakes etc

I've created a table with a wealth of calculations looking at various aspects including brake forces, master cylinder issues and front/rear balance.

https://www.dropbox.com/scl/fi/f23ccya8vi3ll9ubvqy3g/PB-brake-calcs.pdf?rlkey=pkcsnoyykt8i0gzmgg95yen0z&dl=0

https://www.dropbox.com/scl/fi/rt7ceuw6r20tqz1t5nemr/PB-brake-calcs.xlsx?rlkey=t5v9pjaq37jgdz4xcmanl74bi&dl=0

I've covered all the E89 permutations, F series Brembo 4 pot fronts in 340/370/380mm, E90 Brembo 6 pot fronts, Mustang GT350 Brembo fronts, Alcon CP8520 fronts and B21 5 series 345/370mm rear and PB Brakes 6 pot 356mm rear for E89

For the sad bunnies some very interesting data.

What the data doesn't show /can't easily show is

Thermal capacity and heat dissipation of both discs and pads
Impact of changing pad material /type

More to follow

 

[The.Analyst]

Do you have nothing to do with your time ?

Great piece of work

Interesting to see what you assume is not so

 

[B21]

Do you have nothing to do with your time ?

Great piece of work

Interesting to see what you assume is not so

Yes a few surprises in there when you do the maths…essentially the answer is bigger diameter discs then bigger / more pistons..

 

[LittleBlackHawk]

this is an excellent work. would it be possible to add Brembo GT6 to the chart? Thank you very much.

 

[B21]

this is an excellent work. would it be possible to add Brembo GT6 to the chart? Thank you very much.

Do you have a link to a 'GT6'? :tumbleweed: