[NGEE]

Just installed cross-drilled, slotted rotors (ECS) with Hawk ceramic pads. They work great and no dust. However, since installation I notice a vibration on hard braking. It manifests as more sound than shudder - in other words I can hear it kind of loud, but I don't feel much vibration in the steering wheel or anything. Sounds like running over grooved pavement, but a little more subtle.

Is this normal for CD/S rotors?

thanks

[psmitty95]

Yes normal as far as I know. I have had slotted rotors for over a year and have a hum during hard braking also

[CALWATERBOY]

Originally Posted by edrive90

Just installed cross-drilled, slotted rotors (ECS) with Hawk ceramic pads. They work great and no dust. However, since installation I notice a vibration on hard braking. It manifests as more sound than shudder - in other words I can hear it kind of loud, but I don't feel much vibration in the steering wheel or anything. Sounds like running over grooved pavement, but a little more subtle.

>AHEM<

Pads're running over grooved rotors.

[froop]

I just had cool carbons installed with ECS 2 piece slotted and drilled rotors and yes, they're noisy. It almost sounds like a jet engine powering down when I'm braking hard.

[NGEE]

Thanks guys - a load off my mind.

Originally Posted by froop

I just had cool carbons installed with ECS 2 piece slotted and drilled rotors and yes, they're noisy. It almost sounds like a jet engine powering down when I'm braking hard.

Enjoyed the click-thru to your build thread. Sick car!

[froop]

Originally Posted by edrive90

Thanks guys - a load off my mind.


Enjoyed the click-thru to your build thread. Sick car!

Thanks edrive90!

But yeah, the noise and vibration is definitely something a little unnerving at first haha.

[McAuley7]

Originally Posted by CALWATERBOY

>AHEM&lt;

Pads're running over grooved rotors.

LOL^

Anyway you like the brakes from hawk ? I need rears soon

[NGEE]

A little squeaky, and not as bitey as OEM, but dust is gone :^)

[froop]

Originally Posted by edrive90

A little squeaky, and not as bitey as OEM, but dust is gone :^)

The lack of dust is a godsend. Just did my first track event and my wheels are almost as clean after as they were before I started!

[McAuley7]

Squeaky??

[NGEE]

Originally Posted by McAuley7

Squeaky??

Yeah, seems to be a common complaint of Hawk pads. Akebono not so much.

I bedded and re-bedded, but still get a little noise.

[Volasko]

Can you post a picture of the ECS Rotors? I am thinking of going with this setup but I have yet to see it actually installed on an E90.

[Avenged328i]

I also just installed (328i) Cool Carbon brake pads and slotted/drilled rotors and I noticed that there is a lot of vibration when braking between 80-40mph. Is this really normal?
I just had these installed a few days ago. I was thinking I needed an alignment, but was not sure if it was a bad install in the rotors or something is going wrong.
Will someone give me their 2 cents on this? It's really bothering me.
They are a bit noisy when braking, though.

Other than that, these are some good brakes!

[NGEE]

Originally Posted by Avenged328i

I also just installed (328i) Cool Carbon brake pads and slotted/drilled rotors and I noticed that there is a lot of vibration when braking between 80-40mph.

Is it really vibration, or just noise that sounds like vibration? Can you feel the vibration in the steering wheel?

[Avenged328i]

It's really vibration. I can literally feel the car vibrating when braking.
Also, it was really bad at one point, but now it's somewhat better.

But yeah, my wheel is shaking.

Should I continue driving the car or take it in for an alignment?

Thanks for the input!

[Avenged328i]

I found this site to be very helpful.

http://automotivethinker.com/brakes-...d-and-warping/

[David1]

Shaking steering wheel when applying the brakes is from the rotors. They are either not true or you have pad material that transfered to the rotor. I have driven many cars with ceramic brakes with this issue.

[Avenged328i]

Originally Posted by David1

Shaking steering wheel when applying the brakes is from the rotors. They are either not true or you have pad material that transfered to the rotor. I have driven many cars with ceramic brakes with this issue.

What do you suggest I do?

is there anyway I can fix this?
Or should I return the rotors and brakes.

I do have warranty on them.

Also, when is it necessary to bleed the brakes?

[froop]

Originally Posted by Avenged328i

What do you suggest I do?

is there anyway I can fix this?
Or should I return the rotors and brakes.

I do have warranty on them.

Also, when is it necessary to bleed the brakes?

Did you bed the pads properly?

Usually most issues with cool carbons are from improper bedding procedures.

I bedded in mine right after I had them installed with the ECS 2 piece slotted/drilled rotors and whilst they are noisy when braking at high speeds (sounds like a jet engine powering down) I haven't noticed much vibration.

There was one time I noticed some vibration on the track but it went away by the next turn.

[NGEE]

Originally Posted by Avenged328i

It's really vibration. I can literally feel the car vibrating when braking.

Sounds like a warped rotor to me. I'd take it back in to have it checked.

[Avenged328i]

Thanks guys!
I'm going to return the rotor. I do have warranty on them.
Hopefully that helps!

Thanks.