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 > Track / Autocross / Dragstrip / Driving Techniques
 
Lux Angel Eyes
Post Reply
 
Thread Tools Search this Thread
      04-25-2009, 06:57 PM   #1
tallycoolies
Private First Class
tallycoolies's Avatar
United_States
5
Rep
192
Posts

 
Drives: 08 Interlagos Blue M3
Join Date: Sep 2008
Location: PA

iTrader: (2)

Just got done putting RS-19's but...

So I finally got a chance to put RS-19's, front, rear and Motul 600 from the body shop. On the way home, I've tried in the bed in process. Stopping 10 mph from 60 mph, repeating that 8 times, and stopping 10 mph from 80 mph, repeating that 2 times. However, my brake seems to be a softer than before, I was just wondering if this was normal. Also it was squeaking like HELL~!! and people were looking at me like I was a maniac on the street~!! Any comments will be appreciated.
__________________

E92 M3 Coupe\Interlagos Blue\6MT\18"\Technology PK\Premium Sound\Moon Roof\H&R Sport Springs\UUC SSK\GP Thunder 8500K H8 & 12000K HID Xenon\MB Grill\VSR Ti Exhaust\AA X-pipe\AA ECU\AA pulley\VSR CF rear diffuser\VSR CF boot lid\Painted Reflector\Gruppe M CAI\VSR Frontlip\Volk TE-37 19'
Appreciate 0
      04-26-2009, 09:38 AM   #2
Radiation Joe
Veni Vidi Vici
Radiation Joe's Avatar
United_States
37
Rep
2,749
Posts

 
Drives: '11 JB/BBe-6sp-e90
Join Date: Jul 2008
Location: Macungie PA

iTrader: (0)

Garage List
2011 e90 M3-Sold  [4.25]
2003 RS6 - Sold  [0.00]
2009 e90 M3 - Gone  [0.00]
2003 M3 SOLD  [0.00]
old 2002  [5.00]
Quote:
Originally Posted by Laszlo View Post
I'm a bit old school and always bed my brakes slowly... over a 300 mile period... or maybe it was 200... anyway, old German dudes will always tell you to bed them in slowly. But bedding them quickly... works too... just depends on what you want.
Same here. Just drive them on the street for a week or two. Try to get them hot once or twice so that they out-gas a little if they are going to.
Appreciate 0
      04-26-2009, 12:09 PM   #3
JAJ
Captain
17
Rep
933
Posts

 
Drives: 2014 Shelby GT500
Join Date: Apr 2008
Location: Vancouver, BC

iTrader: (4)

Quote:
Originally Posted by tallycoolies View Post
I was just wondering if this was normal. Also it was squeaking like HELL~!! and people were looking at me like I was a maniac on the street~!! Any comments will be appreciated.
I'm not sure what's making them soft - I have SS lines, Castrol SRF and RS-19's and the pedal is very firm (for a non-bbk setup).

Try re-bleeding the brakes - I suspect there's a bubble in there somewhere. It's possible to mix air into the new fluid on a flush and then you get a soft pedal for no obvious reason. Re-bleeding after a couple of days usually solves it.

As for the noise, that's just your new pads telling you how happy they are to be on your car. No, really.
Appreciate 0
      04-26-2009, 06:24 PM   #4
wolftrouble
Private First Class
6
Rep
148
Posts

 
Drives: 2008 M3 Sedan
Join Date: Jan 2009
Location: San Jose, CA

iTrader: (0)

Just did the same thing yesterday: RS-19's and some new 600 temp brake fluid. I agree with you, sort of.

For me at least the brakes are softer at the top of the pedal travel, about the same or 'firmer' than stock at the bottom. I did a couple of hard stops (60 -> 20 or so) to see what would happen and was happy with the results, but also tried some mini-panic-stops (say, 50 -> 35), specifically trying to apply the same amount of braking pressure I would, for example, if I was on the freeway and traffic slowed suddenly.

For those I found it's a bit scary because it's hard to find the right 'bite' point - On stock it felt natural the whole way, with the RS-19's it's a much more abrupt transition from too soft to too firm. It's not that I couldn't slow quickly enough, it's that it was almost too much unless I caught it just right.

But I'm pretty sure this is just a combination of breaking in the pads and getting used to a different grip profile. As for squealing, I get a little bit at only one point in the pedal travel. I stop just a tiny bit harder at lights and such than I used to, and I only get a little squeakiness at the end - nothing bad at all. Did you use anti-squeal compound (or just high-temp grease) when you installed them?
__________________
Appreciate 0
      04-26-2009, 06:46 PM   #5
lucid
Major General
lucid's Avatar
United_States
116
Rep
8,034
Posts

 
Drives: E30 M3; Expedition
Join Date: Apr 2007
Location: USA

iTrader: (0)

Quote:
Originally Posted by wolftrouble View Post
For those I found it's a bit scary because it's hard to find the right 'bite' point - On stock it felt natural the whole way, with the RS-19's it's a much more abrupt transition from too soft to too firm. It's not that I couldn't slow quickly enough, it's that it was almost too much unless I caught it just right.
I find them much more predictable once they warm up on the track.
__________________
Appreciate 0
      04-26-2009, 09:13 PM   #6
tallycoolies
Private First Class
tallycoolies's Avatar
United_States
5
Rep
192
Posts

 
Drives: 08 Interlagos Blue M3
Join Date: Sep 2008
Location: PA

iTrader: (2)

Thanks for all the useful information~!! For now, the brakes are still little too soft, after couples of hard stops that I've made, but I agree with Wolftrouble. It feels like the brake travel bit more than the stock, but feels firm at the end. I guess I just have to wait till this Saturday for my 2nd track session and see what happens. For the squeaking issue, I had a mazda 8 stopped right next to with bunch of high school kids in it ( I guess near prom season) shouting "You got a BMW M3 and the brake is Fu**ed up!! HAHAHAH" man... I just popped out a cigarette and HAD to LMAO~!!
__________________

E92 M3 Coupe\Interlagos Blue\6MT\18"\Technology PK\Premium Sound\Moon Roof\H&R Sport Springs\UUC SSK\GP Thunder 8500K H8 & 12000K HID Xenon\MB Grill\VSR Ti Exhaust\AA X-pipe\AA ECU\AA pulley\VSR CF rear diffuser\VSR CF boot lid\Painted Reflector\Gruppe M CAI\VSR Frontlip\Volk TE-37 19'
Appreciate 0
      04-27-2009, 09:32 AM   #7
GT3 Tim
Moderator
GT3 Tim's Avatar
United_States
30
Rep
1,897
Posts

 
Drives: 2008 E90 M3
Join Date: Feb 2008
Location: Sacramento, CA

iTrader: (0)

I would re-bleed them just to make sure. Other than that, you could have a bit more travel as you prolly mated them to used rotors. After you get them to temp on the track and hammer on them, you can eliminate that. For now, I would bleed them again, just to make sure.
__________________
Tim (apparently likes "3" cars)
E90 M3 -- Current ride
2004 GT3 -- Sold
1997 M3/4 -- Sold
1995 M3 -- Sold
Appreciate 0
      05-02-2009, 05:36 PM   #8
tallycoolies
Private First Class
tallycoolies's Avatar
United_States
5
Rep
192
Posts

 
Drives: 08 Interlagos Blue M3
Join Date: Sep 2008
Location: PA

iTrader: (2)

Just got back from the Pocono's~ and I was completely wrong~!! Lucid you were right~!! After they heat up... DAMn that thing is like a boat anchor. It didn't even fade like the stock pads did. Highly recommended and my worries are all gone~~ Thanks for all the infos~
__________________

E92 M3 Coupe\Interlagos Blue\6MT\18"\Technology PK\Premium Sound\Moon Roof\H&R Sport Springs\UUC SSK\GP Thunder 8500K H8 & 12000K HID Xenon\MB Grill\VSR Ti Exhaust\AA X-pipe\AA ECU\AA pulley\VSR CF rear diffuser\VSR CF boot lid\Painted Reflector\Gruppe M CAI\VSR Frontlip\Volk TE-37 19'
Appreciate 0
      05-03-2009, 12:25 AM   #9
masmole
Lieutenant
6
Rep
489
Posts

 
Drives: 07 RS4, 07 ML63, 06 M5
Join Date: Sep 2005
Location: Chicago, IL

iTrader: (0)

Yeah, I'd re-bleed them just to make sure like GT3 Tim said.

It's possible that the shop you used didn't flush the old fluid thoroughly enough, and instead did more of an extended bleed rather than a thorough flush. How many quarts of Motul did they use?

My shop was very thorough about the brake flush and ended up using nearly 2 bottles of the Castrol SRF I supplied. Keep in mind that Castrol SRF only comes in 1-liter bottles so they completed the flush with nearly 4 quarts of the pricey stuff.

Better safe than finding out the hard way, although I doubt you'll have any issues.
__________________
2008 ///M3 Coupe, AW/FR ext, M-DCT (gone)
2011 GT3
2011 GTI
2010 Q5
Appreciate 0
      09-07-2009, 09:30 PM   #10
Splinter4784
414 little horsies
Splinter4784's Avatar
Armenia
10
Rep
407
Posts

 
Drives: 2008 M3
Join Date: Jan 2009
Location: Beverly Hills

iTrader: (2)

get stainless steel brake lines, the oem brakelines and fluid arent up too par for repeated full stops
__________________
Race Precision Inc
Appreciate 0
      09-08-2009, 08:59 AM   #11
attila
Lieutenant
attila's Avatar
16
Rep
557
Posts

 
Drives: 2011 GT3RS, 2010 MX-5, 2009 M3
Join Date: Dec 2008
Location: Omaha, NE

iTrader: (0)

Quote:
Originally Posted by tallycoolies View Post
So I finally got a chance to put RS-19's, front, rear and Motul 600 from the body shop. On the way home, I've tried in the bed in process. Stopping 10 mph from 60 mph, repeating that 8 times, and stopping 10 mph from 80 mph, repeating that 2 times. However, my brake seems to be a softer than before, I was just wondering if this was normal. Also it was squeaking like HELL~!! and people were looking at me like I was a maniac on the street~!! Any comments will be appreciated.
Don't worry!! You will have similar experience with ant race pads when they are cold!! They appear soft because of less initial bite than stock. But when you warm them properly (track) they will be way better than stock. They have a different operating temp. range. They gona be loud too.
Appreciate 0
      09-08-2009, 03:01 PM   #12
akina335
Second Lieutenant
6
Rep
263
Posts

 
Drives: a car
Join Date: Nov 2007
Location: CA

iTrader: (2)

like others have said try re-bleeding the brakes. when i bleed mine, on the last bleed of every caliper i have someone start the car, hold the brake and crack open the bleeder valve. pedal is always firm. or you can have a pressure bleeder attached to the brake fluid reservoir pumped up to about 15psi and have someone hold the brake pedal down as you crack open the bleeder valve. i only do this on the last bleed of every caliper, not throughout the entire process. hope this makes sense.
__________________
Appreciate 0
      09-08-2009, 03:06 PM   #13
lucid
Major General
lucid's Avatar
United_States
116
Rep
8,034
Posts

 
Drives: E30 M3; Expedition
Join Date: Apr 2007
Location: USA

iTrader: (0)

Guys, read post #9, or the thread, for that matter. He does NOT have an issue with his brakes. It sounds like it was a perception issue associated with the transition to track pads and the way track pads behave when they are cold. Not sure why this thread was revitalized again after 4 months to begin with...
__________________
Appreciate 0
      09-08-2009, 06:31 PM   #14
Dascamel
Lieutenant Colonel
Dascamel's Avatar
20
Rep
1,662
Posts

 
Drives: 2008 e92 M3, 2010 e91 328i
Join Date: Jul 2007
Location: Bakersfield, CA

iTrader: (0)

Quote:
Originally Posted by lucid View Post
Guys, read post #9, or the thread, for that matter. He does NOT have an issue with his brakes. It sounds like it was a perception issue associated with the transition to track pads and the way track pads behave when they are cold. Not sure why this thread was revitalized again after 4 months to begin with...
+1
__________________
2008 E92 M3 Jerez Black,DCT,Fox Red ext,Prem,Tech,19", ipod/usb, CF roof and trim
2010 E91 328i Space Gray,Black int, M sport, most options
2007 Montego Blue 335i (retired)
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
Forum Jump


All times are GMT -5. The time now is 11:11 AM.




m3post
Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, 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