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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > 2012-2019 BMW 3 and 4-Series Forums > Regional Forums > UK > M4 brakes on my F33 (420d SE from 2015) adapters needed?
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      09-29-2019, 09:04 AM   #45
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      09-29-2019, 09:31 AM   #46
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Quote:
Originally Posted by IK6SPEED View Post
I gave the correct information for his retrofit he needed to know, no matter how you try to justify your response.
Maybe you should let BMW know and ask them to stop selling the M Performance brake upgrade then, since you've identified a major issue with compatibility?
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      09-29-2019, 02:52 PM   #47
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Quote:
Originally Posted by Wills2 View Post
Don't BMW do an M performance upgrade for the normal 3 series with slotted disks and red calipers, I'd just get that rather than faffing around trying to make things fit that aren't meant to.
Yes they do... They ar the same as the blue ones just a different colour and as with the blue ones... No faffing is required
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      09-29-2019, 03:16 PM   #48
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Quote:
Originally Posted by R99 View Post
They do - and you can also choose orange or yellow.

Surprisingly..... it doesn’t include a master cylinder upgrade....
Yep. M-Performance brake upgrade front & rear.

~£2K, fitted, when I enquired around 3 years ago. BMW should also re-code the car for the correct braking option.
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      09-29-2019, 03:22 PM   #49
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Quote:
Originally Posted by dizzy619 View Post
Quote:
Originally Posted by IK6SPEED View Post
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Originally Posted by R99 View Post
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Originally Posted by IK6SPEED View Post
And where does the OP state he has M Sport Brakes on his 2015 F33 420d?

The OP pic doesn't show that.

The OP states it came with 17" wheels.

Why is he trying to change a F33 Blue Caliper for a F82 Blue Caliper?

The fact still remains that the Master Brake Cylinder in the OP's car will not sufficiently power the F82 Brakes, which is what I originally stated.
I never said that the OP had M Sport brakes?

It was you that stated:

"The master brake cylinder in the F82 is stronger than in the F3x."

This is not true, as evidenced by the links on the thread, where many cars optioned with M Sport brakes from factory share the same master.

However, it would seem (from looking further since this discussion) that some of the lower powered petrol models do indeed not have the ///M master even when optioned with the ///M brakes. However, this is further proof that the M brakes are compatible with either master!!

I also assume you are aware that BMW sell the M Performance brakes for the F3x range? These are the 370/380 4 pots and 345 2 pots, identical to the ///M calipers.

This retrofit kit does not include a master cylinder upgrade from BMW....
The subject of thread was an OP asking a question.

I gave the correct information for his retrofit he needed to know, no matter how you try to justify your response.

I did not have MSport Brakes on my 2013 and upon retrofit, the brakes have severe fade as the Master Cylinder does not have the power needed. This was corrected by retrofitting the Master Brake Cylinder and Brake Servo Unit from a F8x vehicle.

Real first hand experience.
Maybe you just had a duff master cylinder.. I run the 370/380mm calipers on my 2007 1 Series coupe track car it definitely doesn't have an f80 master cylinder.. Works great... 1st hand experience....
That's like comparing Apples to Oranges.

Of course a 2007 vehicle didn't have a F80 Master Cylinder.
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      09-29-2019, 03:26 PM   #50
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Quote:
Originally Posted by R99 View Post
Quote:
Originally Posted by IK6SPEED View Post
I gave the correct information for his retrofit he needed to know, no matter how you try to justify your response.
Maybe you should let BMW know and ask them to stop selling the M Performance brake upgrade then, since you've identified a major issue with compatibility?
I actually worked directly with connections at Brembo in their racing division to identify the issue.

So really not concerned about what you think I should do.

My post was for OP that does not have the higher power F8x equipment in his car that he's trying to retrofit F80 brakes on.
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      09-29-2019, 03:26 PM   #51
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      10-06-2019, 06:33 AM   #52
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Quote:
Originally Posted by teaston View Post
Correct, best to get TRW or Brembo 2 piece ones from Autodoc or similar.
Great suggestion, got the smaller TRW discs front 370 rear 345 from Autodoc for 300, fitted the M calipers on Friday. Super happy with the result!

Putting the M discs for sale on ebay.

Thanks guys
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      10-06-2019, 08:16 AM   #53
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Quote:
Originally Posted by Logicoeur View Post
The F8x rotors look really good compared to the 370mm but the work needed for 10mm more isn't worth it. Dump the rotors and get some Zimmerman rotors f+r for less than 400. Imo the 340F+345R setup would be even better, with some ecs lightweight rotors up front.
I think your thoughts are a day late. OP says he has already fitted TRW 370 & 345mm (2-piece/lightweight) discs, and is happy with the results.
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      10-06-2019, 01:33 PM   #54
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Quote:
Originally Posted by fuxshiba View Post
Quote:
Originally Posted by teaston View Post
Correct, best to get TRW or Brembo 2 piece ones from Autodoc or similar.
Great suggestion, got the smaller TRW discs front 370 rear 345 from Autodoc for 300, fitted the M calipers on Friday. Super happy with the result!

Putting the M discs for sale on ebay.

Thanks guys
Great result... Give a good session soon and report back if your master cylinder is a problem.
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      10-12-2019, 10:21 AM   #55
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Quote:
Originally Posted by fuxshiba View Post
Quote:
Originally Posted by teaston View Post
Correct, best to get TRW or Brembo 2 piece ones from Autodoc or similar.
Great suggestion, got the smaller TRW discs front 370 rear 345 from Autodoc for 300, fitted the M calipers on Friday. Super happy with the result!

Putting the M discs for sale on ebay.

Thanks guys
Which disc style did you go for?
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      10-12-2019, 10:23 AM   #56
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Quote:
Originally Posted by R99 View Post
The 380mm don't fit - nor do the 370mm rears....

You may as well sell the ///M discs and follow the advice on here to purchase 370mm fronts and 345mm rears.

There is someone I have seen on the FB groups that posted pics of 380mm ///M discs on his F3x but he did not post pics of the mounting solution and seemed to want to keep it guarded - not sure why, but maybe worth looking for the post and asking?

I avoided the problem entirely and had brackets made to fit F10 M5 6pots with 400mm discs!
How much did the brackets set you back? Guessing you kept the original 2 pot M sport calipers on the rear? The sliding m5 rears look so naff
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      11-14-2019, 10:35 AM   #57
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Quote:
Originally Posted by SantaEugence View Post
Which disc style did you go for?
Vented, Slotted / Perforated
https://www.autodoc.co.uk/trw/11015795
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