D2 BBK ordered.....2-5 week wait tho : (

[tertius]

But most speculation here about brake bias won't be any problem. The z4 is so much front biased, that you'd have to do very strange things to get it rear biassed.

It is not about making it rear-biased its whether you have (relatively) too much braking at the rear.

My car with AP kit all round is, in my view, over-braked at the rear if I run matched pads front and rear, so I now run a less aggressive rear pad (RS4-2) vs the front (RS 29).

Having said that if it's for normal road use, I very much doubt if you'd notice any issues.

 

[StevenH72]

.

 

[Bing]

Chillax man, it's Saturday night

 

[Ed Doe]

Silverdevill I'm curious; did you have both front and rear brakes K-Sport 8-Pot items? Who advised you on the ratios of front to rear total brake force?

The reason Im asking is that a front kit only will likely improve the braking performance significantly and without the Ill effects being discussed above. But an imbalanced kit with both front and rear upgrades and no boas valve could cause the issues that have been mentioned previously by those with a lot more knowledge than I!

That's not intended as a criticism in any way, I genuinely want to understand your setup, as I am slightly looking at options for my coupe in the not too distant future, and the K-Sport kit is a gorgeous bit of engineering!

 

[GuidoK]

But most speculation here about brake bias won't be any problem. The z4 is so much front biased, that you'd have to do very strange things to get it rear biassed.

It is not about making it rear-biased its whether you have (relatively) too much braking at the rear.

That's the same thing....

Relative too much braking at the rear is rear biassed.

I have no problem with my front/rear BBK in therms of wrong bias though...
It's spot on imho

 

[Mark-Z4]

Joke this thread is now i mean WTF, get a BBK in ur Z4 and if havnt then dont comment on it i say. :x

I say, don't post on a public forum if you don't want comments. This thread is far from a joke, once again people are trying to help you avoid distaster because it's obvious you don't have a clue what your doing.

Who puts a big brake kit on a 2.0ltr anyway.......

...........have you checked to see if this BBK is compatible for your supposed engine conversion and drivetrain?

 

[BMWZ4MC]

Joke this thread is now i mean WTF, get a BBK in ur Z4 and if havnt then dont comment on it i say. :x

I say, don't post on a public forum if you don't want comments. This thread is far from a joke, once again people are trying to help you avoid distaster because it's obvious you don't have a clue what your doing.

Who puts a big brake kit on a 2.0ltr anyway.......

...........have you checked to see if this BBK is compatible for your supposed engine conversion and drivetrain?

Mark, you've edited the quote to suggest it originates with Silverdevill, not JE....

 

[silverdevill]

Haha!... i had'nt noticed that!.. nevermind, broad shoulders these.....

 

[Beedub]

Nice brake kit !!

bet with a light ass car like the 2.0l models the car will tear your face off when it comes to stopping !!! your going to love these btw.

 

[tertius]

But most speculation here about brake bias won't be any problem. The z4 is so much front biased, that you'd have to do very strange things to get it rear biassed.

It is not about making it rear-biased its whether you have (relatively) too much braking at the rear.

That's the same thing....

Relative too much braking at the rear is rear biassed.

I have no problem with my front/rear BBK in therms of wrong bias though...
It's spot on imho

Fair enough, not how I would use the phrase, but if that is what you meant.

Good that you are happy with your setup, however, my point stands - you can definitely find brake balance issues with these kits, as I experience it. But as I also said for me it's really only a track use issue, on the road you are not likely to see it.

 

[silverdevill]

But as I also said for me it's really only a track use issue, on the road you are not likely to see it.[/quote]

exactly!.....

 

[Ed Doe]

Silverdevill, very interested in feedback on your exact set-up - not sure if you missed my first comment higher up!! Cheers

 

[Nictrix]

...........have you checked to see if this BBK is compatible for your supposed engine conversion and drivetrain?

Thats kinda why I posted earlier, it could be a waste of money

 

[Smartbear]

So really the only thing looks wise i hate about my Zed now is the weedy small brakes and ive replaced the discs with drilled M-tech discs and painted the calippers red and a white BMW decal so i could live with them until now, as i think the front rotas are 280mm and rears are 265mm and the rear calipper is as small as a Tescos beef botpot readymeal for 1, anyway so its partly for looks as need to fill the void in my 313s and partly will be required when or if theres more ponys to handle and i went with D2 cos the coilovers i have are also D2 and are lovely now settled in.
So the D2s ive ordered are 356mm drilled discs with a fixed rota with red 6/4 pot calippers, the rotas are black and edges of disc and coated so no going brown which does my OCD in a treat i tell ya!!! ( basically like the pic ), they will take 2-5 weeks to be delivered so when they are i will get them fitted and post some pics for you to or :thumbsdown:
JE

They look the dogs, certainly make the standard set up appear cheap
Regards

 

[Nictrix]

The bad thing that I can see about these calipers is the pipe that connects both halves of the caliper.
Yamaha had calipers similar to this idea on the Thunderace years ago and they were a pig to bleed because of this pipe.
Later Yamahas had an updated caliper without this pipe on the outside which were one of the best standard calipers on a bike.

 

[Smartbear]

The bad thing that I can see about these calipers is the pipe that connects both halves of the caliper.
Yamaha had calipers similar to this idea on the Thunderace years ago and they were a pig to bleed because of this pipe.
Later Yamahas had an updated caliper without this pipe on the outside which were one of the best standard calipers on a bike.

Should be ok, my elise had the link pipe joining the opposing Pistons & I never had an issue with that when I bled it.
Regards

 

[Beedub]

The bad thing that I can see about these calipers is the pipe that connects both halves of the caliper.
Yamaha had calipers similar to this idea on the Thunderace years ago and they were a pig to bleed because of this pipe.
Later Yamahas had an updated caliper without this pipe on the outside which were one of the best standard calipers on a bike.

Should be ok, my elise had the link pipe joining the opposing Pistons & I never had an issue with that when I bled it.
Regards

its just a balance pipe.... it should have no bearing on bleeding them, everything from this setup to the mclaren/ferarri setups have a balance tube on the brakes. These larger calipers are in general alittle harder to bleed as their is a few nooks where the air bubbles like to hide

 

[silverdevill]

Silverdevill, very interested in feedback on your exact set-up - not sure if you missed my first comment higher up!! Cheers

Hi mate... i've just installed the fronts only (330mm 8 pots, grooved discs) and could'nt be happier with them! can't feel any imbalance so far.



unfortunately i dont have any pics of them on the car yet but i will soon.

 

[GuidoK]

its just a balance pipe.... it should have no bearing on bleeding them, everything from this setup to the mclaren/ferarri setups have a balance tube on the brakes.

Depends on the caliper. The D2 calipers are of 2 piece design, so they must have that pipe, but a 1 piece design (like that mclaren caliper) can either have that pipe, or have a passage internally. Like this ferrari 458

It makes no difference in bleeding though, a pipe on the outside or on the inside.

But there is obiously always a passage otherwise the outer pistons wouldn't do anything.

Ontopic: I think that it's important when buying a BBK set which is not exclusively used for track purpose, to pay attention that the pistons have dirtseals.
Driving around without dirtseals/dustboots is not wise, especially in this cilmate with all the roaddirt etc. Once the piston start to leak you have almost no breaking power left (less pressure and brake fluid can come onto the disc). Also this will irrepreable damage the caliper. Some manufacturers have a choice of 2 sets, one for track only and one for mixed purpose. With the current silicone dustboots heat is also less of an issue.

 

[Mark-Z4]

Mark, you've edited the quote to suggest it originates with Silverdevill, not JE....

I must have been laughing too hard when I was typing, corrected.