Brake upgrade - are these compatible? Suggestions?

You want some 330i calipers to upgrade to 325mm discs. You need the carriers too.

They are a straight bolt on fit.
 
You don't want to downgrade to 330 brakes on a M! :headbang:

I'm not sure if they will fit, I'm not saying they won't though.

M135i brembo 6pots bolt on with an bracket though.
 

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bradz said:
You don't want to downgrade to 330 brakes on a M! :headbang:

I'm not sure if they will fit, I'm not saying they won't though.

M135i brembo 6pots bolt on with an bracket though.
Click to expand...

Thanks Bradz!

I did see those (here is the link to the seller):
https://www.ebay.ie/itm/BMW-M3-E46-...e=STRK:MEBIDX:IT&_trksid=p2055119.m1438.l2649

I was also told they will fit the standard 18' wheels; the only downside I can find is that there is no upgrade for the rear axle...

Maybe the full set of callipers of a M135i could be used (front and rear) with Z4M discs? I wonder how to get the brackets/adaptors...

A
 
That's a silly price!

I paid £650 for the calipers from BMW they use the stock z4m disc. Adaptors from epytec are about £140 iirc

I think you need a small spacer to use them with 224"s

For the rear I have got 996 Brembo 4 pots to match as the 135i ones don't fit without using a different disc and some machining.
 

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bradz said:
You don't want to downgrade to 330 brakes on a M! :headbang:

I'm not sure if they will fit, I'm not saying they won't though.

M135i brembo 6pots bolt on with an bracket though.
Click to expand...

Ah I didn't see the ' "M" Specific" header, I just saw E85. Ignore me then, apologies.
 
bradz said:
That's a silly price!

I paid £650 for the calipers from BMW they use the stock z4m disc. Adaptors from epytec are about £140 iirc

I think you need a small spacer to use them with 224"s

For the rear I have got 996 Brembo 4 pots to match as the 135i ones don't fit without using a different disc and some machining.
Click to expand...
Hey Bradz what calipers are these?
 
thanatu55 said:
bradz said:
You don't want to downgrade to 330 brakes on a M! :headbang:

I'm not sure if they will fit, I'm not saying they won't though.

M135i brembo 6pots bolt on with an bracket though.
Click to expand...

Ah I didn't see the ' "M" Specific" header, I just saw E85. Ignore me then, apologies.
Click to expand...

No worries, thanks for caring to contribute !
 
This is the kit I have:

https://www.vagbremtechnic.com/front-caliper-carrier-kit-allows-fitment-of-aston-martin-db9-or-reversed-audi-ttrs-8j-calipers-to-oe-325mm-or-csl-345mm-discs-ak0007/

11tvjmw.jpg


Brackets and hoses are £250, or £850 including new calipers from Aston Martin. You can also find the calipers s/h from eBay or astonmartinbits.com for about £400 (inc DIY refurb), but they are not as common as the Porsche calipers mentioned by bradz.

I was in a similar situation to you last year and liked the sound of these because the front piston area is within a couple of % of the stock Z4M caliper, so is a good match for the brake master cylinder and therefore preserves pedal travel and braking force. BMW Performance calipers have a ~14% smaller piston area; Porsche 996 / Boxster S are ~20% smaller (front and back). The downside with the VBT kit is that there is no equivalent rear kit available that preserves the stock brake bias. Hypothetically it would be a 4-pot caliper with 31 and 33mm pistons.

If you need new discs and pads and the same time and are thinking of going for a higher performance pad, the cheaper Reyland AP kits are also worth considering, although again you’d need to got front + rear to preserve brake bias (and then you are into >£2k territory). Just upgrading pads and brake cooling would also be a good move if you aren’t too fussed about looks.
 
Attilio said:
Hi,

I am thinking of upgrading the braking system once the discs and pads will have to be replaced. Found this set of callipers on eBay

https://www.ebay.ie/itm/New-BMW-M-E...%3A943187521600abc0da7ec056fff1400b%7Ciid%3A1

I wonder if they are compatible, maybe would require E92 brakes?

Does anyone have experience / suggestions about calliper or full brake upgrades that don't cost a fortune?

thanks in advance!
A
Click to expand...

I would like to upgrade mine at some point also. However I can’t see how these would be an upgrade. They don’t look much better than stock and aren’t even 4/6 pots.

You could get a set of 4 pot Porsche Boxster calipers with the M3/CSL brackets for a easy bolt on solution.
 
Here are the part numbers of the calipers mentioned above, FYI:

2F9DB24B-A05C-4DDB-B357-D67594ED9498.jpeg

Last two characters of the Aston ones are the colour code.
 
MrPT said:
Here are the part numbers of the calipers mentioned above, FYI:

2F9DB24B-A05C-4DDB-B357-D67594ED9498.jpeg

Last two characters of the Aston ones are the colour code.
Click to expand...

So what are you running at the rear Paul?
Standard M calipers?
 
MrPT said:
I was in a similar situation to you last year and liked the sound of these because the front piston area is within a couple of % of the stock Z4M caliper, so is a good match for the brake master cylinder and therefore preserves pedal travel and braking force. BMW Performance calipers have a ~14% smaller piston area; Porsche 996 / Boxster S are ~20% smaller (front and back). The downside with the VBT kit is that there is no equivalent rear kit available that preserves the stock brake bias. Hypothetically it would be a 4-pot caliper with 31 and 33mm pistons.
Click to expand...

I'd certainly be intrested in comparing next time we meet.

Whilst I'm not disagreeing with the tech info, there certainly was a reduction in pedal travel when I fitted the 6 pots. (Compared to freshly bled stock fronts)

I never understood big brake conversions until I fitted one.

The feel and modulation inspires so much confidence in them. Would be good to compare.
 
bmwaddict said:
MrPT said:
Here are the part numbers of the calipers mentioned above, FYI:

2F9DB24B-A05C-4DDB-B357-D67594ED9498.jpeg

Last two characters of the Aston ones are the colour code.
Click to expand...

So what are you running at the rear Paul?
Standard M calipers?
Click to expand...

Yes, just tarted up a bit to match the fronts.

bradz said:
Whilst I'm not disagreeing with the tech info, there certainly was a reduction in pedal travel when I fitted the 6 pots. (Compared to freshly bled stock fronts)
Click to expand...

That does makes sense though. Those 6 pots have less total piston volume than stock, so there will be more piston travel per unit of pedal travel. Pairing them with the 996 rears means there's a bit of a shift from the stock brake bias to the front, but I'm not sure how much us mere mortals would be able to tell. You'd also hope that every option we've discussed is still going to hit the limits of the road/tyres before their own.

The combos to avoid, in my opinion, are just changing the fronts to BMW Performance or Porsche 996 calipers and keeping the stock rears. Big change in brake bias rearwards, and the kind of thing you'd probably find out for the first time when someone's cat suddenly runs out in front of you. :cry:
 
bmwaddict said:
Thanks for the info. :thumbsup:
Click to expand...

BBK shopping is what always happens when the weather is this sh*t. :D

I think it's worth thinking about for weight reduction too. Between lighter weight alloys and caliper upgrades you can save >30kg of unsprung mass vs stock pretty easily. In performance terms that's massive.
 
:D
You've helped add to my already huge shopping list!
Yeah definitely, my Breytons are about half the weight of the Linea Corses I had on before, can't wait to get them on.
 
MrPT said:
This is the kit I have:

https://www.vagbremtechnic.com/front-caliper-carrier-kit-allows-fitment-of-aston-martin-db9-or-reversed-audi-ttrs-8j-calipers-to-oe-325mm-or-csl-345mm-discs-ak0007/

11tvjmw.jpg


Brackets and hoses are £250, or £850 including new calipers from Aston Martin. You can also find the calipers s/h from eBay or astonmartinbits.com for about £400 (inc DIY refurb), but they are not as common as the Porsche calipers mentioned by bradz.

I was in a similar situation to you last year and liked the sound of these because the front piston area is within a couple of % of the stock Z4M caliper, so is a good match for the brake master cylinder and therefore preserves pedal travel and braking force. BMW Performance calipers have a ~14% smaller piston area; Porsche 996 / Boxster S are ~20% smaller (front and back). The downside with the VBT kit is that there is no equivalent rear kit available that preserves the stock brake bias. Hypothetically it would be a 4-pot caliper with 31 and 33mm pistons.

If you need new discs and pads and the same time and are thinking of going for a higher performance pad, the cheaper Reyland AP kits are also worth considering, although again you’d need to got front + rear to preserve brake bias (and then you are into >£2k territory). Just upgrading pads and brake cooling would also be a good move if you aren’t too fussed about looks.
Click to expand...

Thanks everyone and thanks MrPT,

very useful information and thanks for the picture and link. I am starting to realise this is going to be a very expensive project: it is going to require a set of 19' wheels too (or at least spacers - and I am not keen on those).

I might get the new discs and pads and see what my finances are like when I have to replace the tyres (I might get 19' alloys + tyres then) and then upgrade the calipers at a later stage.

I didn't realise it was possible to fit the Boxster S callipers...however, when you factor callipers and pads all round + adapters you are indeed into >2k territory as you said... let's hope the sales commissions in 2018 will be better than those in 2017 :(
 
It is time also for me to change discs and the pads. I was thinking to upgrade to a bigger 6 and 4 pot system but those systems from Brembo, AP Racing and Stoptech cost a leg and an arm.
It is good that I see that there a many other solutions.

My question is if you believe that for a car that never sees racetrack, if it makes sense any upgrade to the brake system? What results should someone expecting when having such an upgrade? Is it something measurable?
 
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