D2 380mm brake kit problem - hard shacking

Hello my dear colleagues.



As I found myself always looking
for answers on this community for my problems and questions about which is the
best mod for my car, what the result for that other people got for the same mod
that I am willing to make, results made possible only by taking chances and spending
time and money of their own pockets, it thing it is time to share back my
experience with you guys. My bad experience, so you could have a chance not to
go and make the same mistakes as I did buying BAD QUALITY products.



My car is an Mit EVO9 (other cars
that I own : STI03, Civic TypeR, BMW E30 M3, Celica CS, Audi S3 1.8T, Dacia
Logan CUP-race car) and some of my mods are : FP Green turbo, Deatschwerks
injectors 750, ARC intake box and titanium intake pipe, HKS cams, HKS
coilovers, Ralliart 18†wheels, and some other small parts.



Recently I wanted to improve the
braking on my car and beside AP Racing 6pot 362mm kit (which I have on my STI
for 3 years-12000km and I love them) and BREMBO GT 6pot 355mm kit I was also
considering the Taiwan company called D2 which makes a massive 380mm 8 piston
kit for the EVO.



2 things made me to make the
wrong decision, the bigger diameter of the rotors, 380mm versus second best AP
Racing 362mm, and the cheaper price compared to the AP and the Brembo kits, so
I got the D2 brake kit. – STUPID MOVE



I know that this topic is not
about me, but a short introduction will show people that I really don’t thing
that the problems with the brakes comes from bad installing or abuse : I run in
my country a tuning company called Superformance, dealer of SKN Tuning Gmbh
since 2007, with some rally and hill climb activity in the last years : tech
support in 2009 for hill climb national champion open category in an EVO6, and
my personal race history running with 1.6 Dacia Logan : 2008 FIA GT Logan Cup
first race winner and after disqualified due to engine modifications, second
race second place, 2009 hill climb champion at 1.6 category .



My “raceâ€car : http://bloganul.blogspot.com/2010/11/loganul-skn-lui-andrei-tentean-de.html




About the FIA GT event: http://prorally.ro/net/index.php?option=com_content&task=view&id=2964&Itemid=31



After installing the D2 380mm
front brake kit I have made the brake in myself in a period of 450-500 km.



After the brake in was over I
started to use the brakes with moderate to full pedal pressure in different
conditions to see what I have paid for, first results where not impressive ,
not bad but somehow different than what I was expecting . Brake pedal travel was bigger/longer than
before and with a somehow unnatural behavior, first part of pedal push was
return less braking than expected and the next part was locking the tires
pretty easy. I suppose this is normal, the pedal travel should be longer
because of the increased fluid than goes in the bigger than stock caliper and
tires look is due to the excessive 380mm size ! – So first lesson : for the
street using normal street tires you do not need 380mm discs to stop an EVO.



The biggest problem came in the
next 1500 km (all on the street, should have happened earlier on a track day or
weekend), shacking under breaking become more and more obvious to a point the
is nor pleasant or safe to drive the car anymore and stopping at a stop light the car will stop
itself after releasing the brake pedal
at 1 or 2 km/h and this means only one thing : pads are still touching(or even
pushing) against the disc even when brake pressure is not applied !!



After checking the wheel and tire
balancing TWICE (and i do have the receipts to prove it) which was perfect
exactly as I imagined because I run on Ralliart RAYS forged 18â€wheels and I
always look after them, I put the car in the garage and make the next
measurements which I also filmed to send to D2 but for no good because the
answer was fast and clear – it is my fault, no warranty on brake discs.



I tried to explain that heat
damage to the discs came from heat build up during roll on from the faulty
calipers which do not release the pads from touching the disc but the answer
was still the same – no warranty for the brake discs !!! STUPID ME FOR BUYING
D2 !!







Same tests for both sides, left
and right.



You can see in the movies that
the calipers are expanding under pedal pressure, this is bad manly for the
performance orientated customer how will want some feedback from the brake
pedal ! Pressure is wasted in the bad design and probably bad material caliper
instead of going to the pistons and so on to the pads !







LEFT D2 caliper expanding under pressure



http://www.youtube.com/watch?v=qEc29-ziWp8



RIGHT D2 caliper expanding under pressure



http://www.youtube.com/watch?v=59Duap_A4iY







Here you can see that using a
dynamometric wrench we could approximate the effort needed to turn ONLY the
disc – 30 Nm to a side and 45 Nm to the other !!! This is EXTREME ! This D2
people are wasting our hard earned horsepower !!



LEFT D2 rotor 45Nm to rotate



http://www.youtube.com/watch?v=FzVtv6CeVx8



RIGHT D2 rotor 30Nm to rotate



http://www.youtube.com/watch?v=o_5sjPRCrZk







And here you can see and imagine
the shacking under braking !! discs are fucked up in less than 2000km, that is
less than 1250 miles !!



LEFT D2 rotor moving left and
right



http://www.youtube.com/watch?v=6c2BEJ7sPOU



RIGHT D2 rotor moving left and
right



http://www.youtube.com/watch?v=7dglzqIseEE



LEFT D2 rotor moving up and down



http://www.youtube.com/watch?v=32Dybh2NyCA



RIGHT D2 rotor moving up and down



http://www.youtube.com/watch?v=JUbCSs9gHHY







So maybe I am unfortunate, or
maybe I really do not know how to brake or use a set of brakes, or even both,
but I will not come close to the D2 ever again. Anybody can make mistakes but
not to take responsibility for your product is not Ok. Hope this helps.

 

no, I didn't check that until now.
Thank you for the suggestion.
It seems ok, it is the oem brake cylinder.