BMW M3 Forum (E90 E92)

BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read


Go Back   M3Post - BMW M3 Forum > E90/E92 M3 Technical Topics > Suspension | Brakes | Chassis
 
EXXEL Distributions
Post Reply
 
Thread Tools Search this Thread
      12-31-2017, 02:05 PM   #1
Redd
Captain
225
Rep
733
Posts

Drives: 2010 BMW E92 M3 Dakar Edition
Join Date: Jul 2015
Location: Malaysia

iTrader: (0)

Brembo GT pedal feel

I recently tried a friend's car with AP Racing bbk and the pedal feels much firmer than my M3 with Brembo GT bbk. Is this normal?
Appreciate 0
      01-01-2018, 11:02 PM   #2
ashtaron14
Captain
ashtaron14's Avatar
Hong Kong
247
Rep
803
Posts

Drives: E90 M3 6MT
Join Date: Jun 2011
Location: HK

iTrader: (0)

If you are using the brake pads that came with the Brembo GT, then yes the pedal feel as well as the stopping power will not reflect the capabilities of these brakes at all.

Perhaps you can ask your friend what pads he's using on his AP.
__________________
Appreciate 0
      01-02-2018, 12:22 AM   #3
Green-Eggs
Major
United_States
281
Rep
1,200
Posts

Drives: BMW
Join Date: Jul 2007
Location: Los Angeles

iTrader: (3)

What kind of tires and suspension was on your friend's car?
Appreciate 0
      01-02-2018, 04:08 AM   #4
Redd
Captain
225
Rep
733
Posts

Drives: 2010 BMW E92 M3 Dakar Edition
Join Date: Jul 2015
Location: Malaysia

iTrader: (0)

KW V3, forgot what tires but I think they were PSS. I have Ohlins R/T and Advan AD08R rubber.

How would suspension/tires affect pedal feel?
Appreciate 0
      01-02-2018, 05:16 AM   #5
roastbeef
Major General
roastbeef's Avatar
United_States
3400
Rep
7,442
Posts

Drives: E92 M3
Join Date: Nov 2010
Location: Orange County, CA

iTrader: (1)

pad compound will influence pedal feel more than anything. another factor is rotor design- are his rotors slotted? slotted vs drilled rotors has been debated to influence pad bite. another factor is fluid and stainless lines.
__________________
Appreciate 0
      01-02-2018, 01:33 PM   #6
Green-Eggs
Major
United_States
281
Rep
1,200
Posts

Drives: BMW
Join Date: Jul 2007
Location: Los Angeles

iTrader: (3)

Movement of the car through suspension may cause more brake effort due to the feeling of the weight shifting under braking.

R compound/slick tires requires more effort to stop when cold along with the pads.

Pad compound plays a huge role. Also, maybe there is a little air in your system. Are both brake boosters the same? Brake booster pressure plays a role as well. The brake booster for cars with ceramic brakes is different than steel.
Appreciate 0
      01-02-2018, 08:07 PM   #7
slonik
BimmerPost Supporting Vendor
slonik's Avatar
Russia
267
Rep
363
Posts


Drives: e46 M3, e82v8 (s65 swapped)
Join Date: Feb 2015
Location: Moscow Region, Zhukovsky

iTrader: (0)

Send a message via ICQ to slonik Send a message via Skype™ to slonik
Quote:
Originally Posted by roastbeef View Post
pad compound will influence pedal feel more than anything. another factor is rotor design- are his rotors slotted? slotted vs drilled rotors has been debated to influence pad bite. another factor is fluid and stainless lines.
hub bearings condition add a lot of pedal travel feel.
Appreciate 0
      01-02-2018, 08:11 PM   #8
roastbeef
Major General
roastbeef's Avatar
United_States
3400
Rep
7,442
Posts

Drives: E92 M3
Join Date: Nov 2010
Location: Orange County, CA

iTrader: (1)

I'm sort of presuming everything is in good working condition.
__________________
Appreciate 0
      01-02-2018, 08:15 PM   #9
swhat
Lieutenant
55
Rep
555
Posts

Drives: '11 MW E92
Join Date: May 2010
Location: Bay Area

iTrader: (1)

When I first installed my GT kit, I felt the same way. It didn't bit as hard as the stock brakes, but now I have come to love the pedal feel because you get so much more feel for brake modulation.
Appreciate 0
      01-02-2018, 08:28 PM   #10
Redd
Captain
225
Rep
733
Posts

Drives: 2010 BMW E92 M3 Dakar Edition
Join Date: Jul 2015
Location: Malaysia

iTrader: (0)

Quote:
Originally Posted by roastbeef View Post
I'm sort of presuming everything is in good working condition.
Yes. Hub bearings no noise. All brake components - master cylinder, booster, vacuum sensor - changed in the last 12 months. Using Project Mu HC+ pads and Endless RF650 fluid, both known to provide excellent pedal feel.

Looks like may just be a difference between Brembo and AP products.
Appreciate 0
      01-02-2018, 08:29 PM   #11
Redd
Captain
225
Rep
733
Posts

Drives: 2010 BMW E92 M3 Dakar Edition
Join Date: Jul 2015
Location: Malaysia

iTrader: (0)

Quote:
Originally Posted by swhat View Post
When I first installed my GT kit, I felt the same way. It didn't bit as hard as the stock brakes, but now I have come to love the pedal feel because you get so much more feel for brake modulation.
Ok that's good to know. Cos I got my Brembo GT used and was afraid there may be something wrong with the calipers. Car stops very well, just the feel wasn't as good as stock or the AP.
Appreciate 0
      01-02-2018, 08:53 PM   #12
slonik
BimmerPost Supporting Vendor
slonik's Avatar
Russia
267
Rep
363
Posts


Drives: e46 M3, e82v8 (s65 swapped)
Join Date: Feb 2015
Location: Moscow Region, Zhukovsky

iTrader: (0)

Send a message via ICQ to slonik Send a message via Skype™ to slonik
Quote:
Originally Posted by Redd View Post
Yes. Hub bearings no noise. All brake components - master cylinder, booster, vacuum sensor - changed in the last 12 months. Using Project Mu HC+ pads and Endless RF650 fluid, both known to provide excellent pedal feel.

Looks like may just be a difference between Brembo and AP products.
hub bearings has a lot of play under load before any noise will start.

i had front bearing with play more then a year, and it didn't make any sound. i've seen it only when fitted winter wheels without spacers, with 2mm caliper to rim's spokes clearance. one side worked okay and on other spokes touched caliper under braking or cornering even without applying brake.
also i had a problem before bearing was changed, that pads on this side overheating a lot quicker and worns two times faster.

i saw similar problems on different cars (bmw, vw etc), and all of hubs make no sound.
if you have trackdays (or regular fast driving) time to time, after 50k miles you have a lot of chances to get worned hub bearings.
Appreciate 0
      01-02-2018, 08:54 PM   #13
slonik
BimmerPost Supporting Vendor
slonik's Avatar
Russia
267
Rep
363
Posts


Drives: e46 M3, e82v8 (s65 swapped)
Join Date: Feb 2015
Location: Moscow Region, Zhukovsky

iTrader: (0)

Send a message via ICQ to slonik Send a message via Skype™ to slonik
Quote:
Originally Posted by Redd View Post
Ok that's good to know. Cos I got my Brembo GT used and was afraid there may be something wrong with the calipers. Car stops very well, just the feel wasn't as good as stock or the AP.
ap calipers has smaller pistons area, sometimes even smaller than stock calipers.
Appreciate 0
      01-02-2018, 09:21 PM   #14
roastbeef
Major General
roastbeef's Avatar
United_States
3400
Rep
7,442
Posts

Drives: E92 M3
Join Date: Nov 2010
Location: Orange County, CA

iTrader: (1)

You know what, I'm about to say it. AP Racing is better than Brembo.
Attached Images
 
__________________
Appreciate 0
      01-02-2018, 09:37 PM   #15
dparm
Major General
dparm's Avatar
United_States
1546
Rep
5,999
Posts

Drives: Corvette Grand Sport
Join Date: Jun 2013
Location: Chicago, IL

iTrader: (0)

Quote:
Originally Posted by Redd View Post
I recently tried a friend's car with AP Racing bbk and the pedal feels much firmer than my M3 with Brembo GT bbk. Is this normal?

Honestly, it's hard to pin this down to a single reason. It could be a combination of things. A braking system is just that: a system. There are many components and it could be a lot of little things that add up, or it could be a bit of a placebo effect.

You'd have to set up some pretty strict testing conditions to narrow it down. Ideally, something like this: same car, pads, fluid, track temperature, ambient temperature, airflow, etc.

I also missed my chance for "inb4 because Brembo sucks".
__________________
Now: 2017 Corvette Grand Sport
Past: 2011.5 M3 sedan ZCP
Appreciate 1
roastbeef3400.00

      01-02-2018, 11:36 PM   #16
Redd
Captain
225
Rep
733
Posts

Drives: 2010 BMW E92 M3 Dakar Edition
Join Date: Jul 2015
Location: Malaysia

iTrader: (0)

I had the hub bearings checked numerous times by mechanic and alignment shop and all said no free play, no need to replace.

Lol. So much hate for Brembo? 😂
Appreciate 0
      01-03-2018, 02:51 AM   #17
ashtaron14
Captain
ashtaron14's Avatar
Hong Kong
247
Rep
803
Posts

Drives: E90 M3 6MT
Join Date: Jun 2011
Location: HK

iTrader: (0)

Quote:
Originally Posted by roastbeef View Post
You know what, I'm about to say it. AP Racing is better than Brembo.
The thing is... AP Racing is owned by Brembo

AP is wonderful
Brembo is great
Alcon is pretty nice
__________________
Appreciate 0
      01-03-2018, 09:59 AM   #18
pbonsalb
Major General
1278
Rep
5,241
Posts

Drives: 08 E90 M3, 99 E36 M3 Turbo
Join Date: Feb 2011
Location: Concord, NH

iTrader: (3)

I vote difference in brake pads. Buy the pads your friend has if you have driven his similar car on a track similar to what you run on. Don't go by how they feel on the street and assume that is how they feel with heat in them on the track.
Appreciate 0
      01-03-2018, 11:23 AM   #19
roastbeef
Major General
roastbeef's Avatar
United_States
3400
Rep
7,442
Posts

Drives: E92 M3
Join Date: Nov 2010
Location: Orange County, CA

iTrader: (1)

Quote:
Originally Posted by ashtaron14 View Post
The thing is... AP Racing is owned by Brembo

AP is wonderful
Brembo is great
Alcon is pretty nice
it was a half-hearted joke.

vw owns porsche. porsche is better than vw. sup?
__________________
Appreciate 0
      01-03-2018, 11:29 AM   #20
ashtaron14
Captain
ashtaron14's Avatar
Hong Kong
247
Rep
803
Posts

Drives: E90 M3 6MT
Join Date: Jun 2011
Location: HK

iTrader: (0)

Quote:
Originally Posted by roastbeef View Post
Quote:
Originally Posted by ashtaron14 View Post
The thing is... AP Racing is owned by Brembo

AP is wonderful
Brembo is great
Alcon is pretty nice
it was a half-hearted joke.

vw owns porsche. porsche is better than vw. sup?
Porsche brakes are the best
__________________
Appreciate 0
      01-03-2018, 12:22 PM   #21
buddalun
Lieutenant Colonel
buddalun's Avatar
United_States
543
Rep
1,776
Posts

Drives: '12 ZCP M3 & 911
Join Date: Dec 2014
Location: USA

iTrader: (7)

Quote:
Originally Posted by ashtaron14 View Post
Porsche brakes are the best
But, but, Porsche brakes are Brembo!
Appreciate 0
      01-03-2018, 03:04 PM   #22
M43S7RO
Lieutenant
205
Rep
550
Posts

Drives: Jerez Black E92 M3
Join Date: Sep 2015
Location: Peoria, AZ

iTrader: (11)

Seems you may be referring to bite. If so, then feel is going to be heavily pad dependent. More track oriented pads will not bite as well/feel mushy when not in optimal operating range.

You both would have to run the same pads for a better comparison, without factoring in the aspects others have mentioned.

I run Hawk HPS 5.0, which is a street pad. Even then, the initial bite is not as good as oem when cold. Once up to temp though after a few stops, then it bites much better than stock.


Quote:
Originally Posted by Redd View Post
Ok that's good to know. Cos I got my Brembo GT used and was afraid there may be something wrong with the calipers. Car stops very well, just the feel wasn't as good as stock or the AP.
__________________
aFe Stage 2 Intake | BW Race X-Pipe | UUC Corsa Exhaust | Alpine MS Tune | Apex PS-7 F: 19x10 et 23 275x30 AD08R R: 19x10.5 et 25 295/30 PSS | Brembo GT

Last edited by M43S7RO; 01-03-2018 at 03:54 PM.
Appreciate 0
Post Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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


All times are GMT -4. The time now is 12:06 AM.




m3post
Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST