Go Back   6speedonline.com Forums > Porsche (Present) > 996 Turbo / GT2
Sign in using an external account
Register Forgot Password?

996 Turbo / GT2 Turbo discussion on previous model 2000-2005 Porsche 911 Twin Turbo and 911 GT2.
Sponsored By Vivid Racing

Brake Vibration

Reply
 
 
 
 
Thread Tools Search this Thread Rate Thread Display Modes
  #1  
Old 11-07-2010, 12:11 PM
vshugo996's Avatar
Registered User
 
Join Date: May 2010
Location: Portugal
Posts: 243
Rep Power: 21
vshugo996 is a splendid one to beholdvshugo996 is a splendid one to beholdvshugo996 is a splendid one to beholdvshugo996 is a splendid one to beholdvshugo996 is a splendid one to beholdvshugo996 is a splendid one to beholdvshugo996 is a splendid one to behold
Brake Vibration

Hi,

I upgrade my 996 TT breaks to a 6 pots calipers and 350mm disc from 997 TT.

After install, every time I brake I feel a stong vibration in the brake pedal and steering wheel.

After this, I install new pads and the problem continue...

Now I install new discs. The car brake fine at low speed. But when I brake in high speed the vibration returns.

What should I do to solve this problem?

Thanks...

Last edited by vshugo996; 11-07-2010 at 12:22 PM.
Reply With Quote
  #2  
Old 11-07-2010, 12:32 PM
Banned
 
Join Date: Nov 2008
Location: San Francisco
Posts: 696
Rep Power: 52
porka has a brilliant futureporka has a brilliant futureporka has a brilliant futureporka has a brilliant futureporka has a brilliant futureporka has a brilliant futureporka has a brilliant futureporka has a brilliant futureporka has a brilliant futureporka has a brilliant futureporka has a brilliant future
Quote:
Originally Posted by vshugo996 View Post
Hi,

I upgrade my 996 TT breaks to a 6 pots calipers and 350mm disc from 997 TT.

After install, every time I brake I feel a stong vibration in the brake pedal and steering wheel.

After this, I install new pads and the problem continue...

Now I install new discs. The car brake fine at low speed. But when I brake in high speed the vibration returns.

What should I do to solve this problem?

Thanks...
i also just installed 6 pistons/350mm rotors, i have had a couple weird issues like you.

i also have some juddering at high speeds when braking - this has started to go away but is still present.

i have also noticed that over large crests i.e ups and downs the brake pedal on occasion has kicked back at my foot. this can be quite scary whilst trail braking around a corner.

all these issues have pretty much gone away now, im no mechanic but i think its down to the abs/gizmos syncing. in addition the brakes needed to be broken in.

give them another 200 miles of driving and report back.

i have around 300 miles on my brakes total and im extremely happy with the upgrade. i highly recommend avoiding the oem pads. i drove a car with 6 pots and 350mm and oem pads all the way around. it it felt like the cars brakes were totally stock.

im using pagids in the front and oem in the rear, and the brake bite is amazing. i plan to upgrade the rear pads once they wear out a bit and upgrade to 350mm rotors in the rear!

Btw you can blame Enrrique (F1crazydriver) i drive his car and it makes me want to do upgrades! he is a top guy though!

mike

Last edited by porka; 11-07-2010 at 12:35 PM.
Reply With Quote
  #3  
Old 11-07-2010, 12:45 PM
vshugo996's Avatar
Registered User
 
Join Date: May 2010
Location: Portugal
Posts: 243
Rep Power: 21
vshugo996 is a splendid one to beholdvshugo996 is a splendid one to beholdvshugo996 is a splendid one to beholdvshugo996 is a splendid one to beholdvshugo996 is a splendid one to beholdvshugo996 is a splendid one to beholdvshugo996 is a splendid one to behold
I have EBC red pads at front and oem at rear.

There are more users with this upgrade. Have you the same problem?

Thanks.
Reply With Quote
  #4  
Old 11-07-2010, 04:01 PM
landjet's Avatar
Registered User
 
Join Date: Apr 2007
Location: Maryland
Posts: 3,679
Rep Power: 267
landjet has a reputation beyond reputelandjet has a reputation beyond reputelandjet has a reputation beyond reputelandjet has a reputation beyond reputelandjet has a reputation beyond reputelandjet has a reputation beyond reputelandjet has a reputation beyond reputelandjet has a reputation beyond reputelandjet has a reputation beyond reputelandjet has a reputation beyond reputelandjet has a reputation beyond repute
The PSM makes the brake pedal push back but you can override it by pushing harder, but I agree it can be unnerving.

As far as the vibration under high speed braking, I would recheck that the caliper bolts are torqued to 63ft/lbs. Other than that I don't know what could be making it vibrate unless you are getting pad material buildup on the rotors from high sped braking with stock pads.
Reply With Quote
  #5  
Old 11-07-2010, 04:48 PM
Banned
 
Join Date: Nov 2008
Location: San Francisco
Posts: 696
Rep Power: 52
porka has a brilliant futureporka has a brilliant futureporka has a brilliant futureporka has a brilliant futureporka has a brilliant futureporka has a brilliant futureporka has a brilliant futureporka has a brilliant futureporka has a brilliant futureporka has a brilliant futureporka has a brilliant future
Quote:
Originally Posted by landjet View Post
The PSM makes the brake pedal push back but you can override it by pushing harder, but I agree it can be unnerving.

As far as the vibration under high speed braking, I would recheck that the caliper bolts are torqued to 63ft/lbs. Other than that I don't know what could be making it vibrate unless you are getting pad material buildup on the rotors from high sped braking with stock pads.
i will make sure my caliper bolts are torqued down sufficently.

thanks for the advice, mike
Reply With Quote
  #6  
Old 11-07-2010, 06:07 PM
Registered User
 
Join Date: Nov 2010
Location: Michigan
Posts: 61
Rep Power: 6
Porsche GT3 is on a distinguished road
Quote:
Originally Posted by porka View Post
i will make sure my caliper bolts are torqued down sufficently.

thanks for the advice, mike

If it persist, check if your rotors are warped. Had that once on my Merc..
Reply With Quote
  #7  
Old 11-07-2010, 06:12 PM
FAST FWD's Avatar
Registered User
 
Join Date: Dec 2007
Location: Indiana
Posts: 1,159
Rep Power: 100
FAST FWD has a reputation beyond reputeFAST FWD has a reputation beyond reputeFAST FWD has a reputation beyond reputeFAST FWD has a reputation beyond reputeFAST FWD has a reputation beyond reputeFAST FWD has a reputation beyond reputeFAST FWD has a reputation beyond reputeFAST FWD has a reputation beyond reputeFAST FWD has a reputation beyond reputeFAST FWD has a reputation beyond reputeFAST FWD has a reputation beyond repute
Send a message via Skype™ to FAST FWD
This sounds like pads not bedded to the rotors. You need to get pad material uniformly transferred to the rotor for them to work properly. The procedure is described here, among other places:
http://www.braketechnology.com/brakepadbedding.html

Look for a dull, blue-brown color on the rotors to indicate pad material transfer. See photo below.

Jon
Attached Thumbnails
Click image for larger version

Name:	P1010002.jpg
Views:	74
Size:	209.2 KB
ID:	136878  
__________________
_______________________________
2001 996 TT Orient Red - Gone to a good home
Reply With Quote
  #8  
Old 11-07-2010, 09:20 PM
ard ard is offline
Registered User
 
Join Date: Jan 2007
Location: N. California
Posts: 2,964
Rep Power: 262
ard has a reputation beyond reputeard has a reputation beyond reputeard has a reputation beyond reputeard has a reputation beyond reputeard has a reputation beyond reputeard has a reputation beyond reputeard has a reputation beyond reputeard has a reputation beyond reputeard has a reputation beyond reputeard has a reputation beyond reputeard has a reputation beyond repute
Quote:
Originally Posted by FAST FWD View Post
This sounds like pads not bedded to the rotors. You need to get pad material uniformly transferred to the rotor for them to work properly. The procedure is described here, among other places:
http://www.braketechnology.com/brakepadbedding.html

Look for a dull, blue-brown color on the rotors to indicate pad material transfer. See photo below.

Jon
My vote as well....cannot tell you how often you hear 'warped rotors' and it isn't. Sure, they turn them and that 'fixes' it, but it is just pad deposition on the rotor.
__________________
2004 996TT X50 Slate (EP2L, Wastegate Upgrade, DVs, UMW Flashes, Moton Club Sport Double Adjustable, HRE C20s 265/315x18)
Reply With Quote
  #9  
Old 11-07-2010, 10:18 PM
Banned
 
Join Date: Nov 2008
Location: San Francisco
Posts: 696
Rep Power: 52
porka has a brilliant futureporka has a brilliant futureporka has a brilliant futureporka has a brilliant futureporka has a brilliant futureporka has a brilliant futureporka has a brilliant futureporka has a brilliant futureporka has a brilliant futureporka has a brilliant futureporka has a brilliant future
Quote:
Originally Posted by ard View Post
My vote as well....cannot tell you how often you hear 'warped rotors' and it isn't. Sure, they turn them and that 'fixes' it, but it is just pad deposition on the rotor.
the rotors are brand new fellas!

to be honest i just drove the car.. i think all my issues have gone away..

no bouncing pedal or juddering.. they do sound like a freight trane.. but i think its funny.. rolling in the city and people are like wtf
Reply With Quote
  #10  
Old 11-08-2010, 06:55 AM
FAST FWD's Avatar
Registered User
 
Join Date: Dec 2007
Location: Indiana
Posts: 1,159
Rep Power: 100
FAST FWD has a reputation beyond reputeFAST FWD has a reputation beyond reputeFAST FWD has a reputation beyond reputeFAST FWD has a reputation beyond reputeFAST FWD has a reputation beyond reputeFAST FWD has a reputation beyond reputeFAST FWD has a reputation beyond reputeFAST FWD has a reputation beyond reputeFAST FWD has a reputation beyond reputeFAST FWD has a reputation beyond reputeFAST FWD has a reputation beyond repute
Send a message via Skype™ to FAST FWD
Quote:
Originally Posted by porka View Post
the rotors are brand new fellas!

to be honest i just drove the car.. i think all my issues have gone away..

no bouncing pedal or juddering.. they do sound like a freight trane.. but i think its funny.. rolling in the city and people are like wtf
Mike - The fact thatthe rotors are new is the giveaway. When rotors are new, they have no pad material transferred to them. Until you get a uniform layer put down on the rotor, the brakes stick-slip when you apply them.

Glad the problem went away. I think this shows that Ard and I had the right diagnosis.

Jon
__________________
_______________________________
2001 996 TT Orient Red - Gone to a good home
Reply With Quote
  #11  
Old 03-26-2011, 03:11 PM
Etchhead's Avatar
Registered User
 
Join Date: Apr 2009
Location: San Jose Ca
Age: 44
Posts: 1,094
Rep Power: 60
Etchhead has much to be proud ofEtchhead has much to be proud ofEtchhead has much to be proud ofEtchhead has much to be proud ofEtchhead has much to be proud ofEtchhead has much to be proud ofEtchhead has much to be proud ofEtchhead has much to be proud ofEtchhead has much to be proud of
brake shuddering at high speed

Had the same thing with my new Cool Carbon pads. Didn't have much time to bed them in before a hard day at Laguna Seca. They performed fantastic at first but then as they heated (15mins in) they began to shake pedal and steering wheel pretty badly.

Then upon cooling they were fine again. Then nasty at temp and speed the following runs.

Not sure if I need to turn the rotors (stock) an try to re-bed?

Suggestions?
Reply With Quote
  #12  
Old 03-26-2011, 06:45 PM
ard ard is offline
Registered User
 
Join Date: Jan 2007
Location: N. California
Posts: 2,964
Rep Power: 262
ard has a reputation beyond reputeard has a reputation beyond reputeard has a reputation beyond reputeard has a reputation beyond reputeard has a reputation beyond reputeard has a reputation beyond reputeard has a reputation beyond reputeard has a reputation beyond reputeard has a reputation beyond reputeard has a reputation beyond reputeard has a reputation beyond repute
Quote:
Originally Posted by Etchhead View Post
Had the same thing with my new Cool Carbon pads. Didn't have much time to bed them in before a hard day at Laguna Seca. They performed fantastic at first but then as they heated (15mins in) they began to shake pedal and steering wheel pretty badly.

Then upon cooling they were fine again. Then nasty at temp and speed the following runs.

Not sure if I need to turn the rotors (stock) an try to re-bed?

Suggestions?
Cost nothing to try a re-bed.

New pads and a hot outing is asking for a bedding/pad transfer issue... one of the cardinal rules with bedding is this: once you get the brakes crazy hot/up to temperature, DO NOT come to a full stop until they cool down...whatever you do, you do not want to have a hot pad sitting in contact with a hot rotor in just one position.

Sometimes a very aggressive pad can be used to 'clean up' a rotor, then rebed with street pads....


Give the bedding a shot, see how it does

A
__________________
2004 996TT X50 Slate (EP2L, Wastegate Upgrade, DVs, UMW Flashes, Moton Club Sport Double Adjustable, HRE C20s 265/315x18)
Reply With Quote
  #13  
Old 03-26-2011, 06:51 PM
tonka858's Avatar
Registered User
 
Join Date: Feb 2011
Posts: 711
Rep Power: 46
tonka858 has much to be proud oftonka858 has much to be proud oftonka858 has much to be proud oftonka858 has much to be proud oftonka858 has much to be proud oftonka858 has much to be proud oftonka858 has much to be proud oftonka858 has much to be proud oftonka858 has much to be proud oftonka858 has much to be proud of
alot of times new rotors are covered in cosmoline. to prevent them from rusting..
if you get a can or 2 of berrymans break cleaner and a towel you can get alot of it off.
fyi you will see smoke for a day or so while it burns off.
Reply With Quote
Old 03-26-2011, 06:51 PM
 
 
 
Reply

Tags
6speedonline, 996, back, brake, brakes, braking, break, car, foot, making, pedal, push, time, vibrate, vibrating, vibration


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are Off


Join 6SpeedOnline
Visit our Sponsors

All times are GMT -6. The time now is 12:31 PM.


Secure Backup