E90Post
 


Coby Wheel
 
BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Suspension | Brakes | Chassis > What is normal brake pedal feel?



Reply
 
Thread Tools Search this Thread
      09-02-2020, 12:27 PM   #1
Vulcan50
Captain
326
Rep
698
Posts

Drives: e92 335i
Join Date: Mar 2017
Location: Peoria, IL

iTrader: (0)

What is normal brake pedal feel?

So back in Febuary my car went under the knife, and due to a number of factors, primarily time, its only just now about ready. So one of the many things i did was address the brakes. i went new rotors, stainless flex line, pads and painted the calipers while they were off. However during this process i F**ked up. I had learned about depresing the pedal with a board to prevent leaking. But I decided against that because of my timeline and didn't want to damage the seat. I figured that a few drips wouldnt be a big issue, I was flushing the system anyway. Had some cardboard down to catch the few drips, and i figured that as a sealed system, there wouldn't be much, similar to putting your finger over the end of a straw. I was wrong. it all drained out.

so by the time i got back in there it was way to late. in the end, I ran the bleed procedure in INPA, and it all went exactly how the video showed. took it out for a drive and didnt have bite till the very end (as i remember), and what i had was not safe stopping (again as I remember). fast forward to yesterday, i finally got ISTA working and reset the brake bite. Now it feels safe, for what little i did, about 10mph-0, but i cant for the life of me remember what it actually felt like before this disaster.

Id describe the new feel as an exponential graph appears. basicly through about 1/3 stroke nothing happens just enough to notice the brakes are on, not doing anything. 1/3-2/3 slow stoping like in town sunday driving. finally the final 1/3 starts at reasonable braking and ends at (if not for ABS) locking the wheels. It just feels like nothing for over 1/2 of the pedal travel.

Can anyone verify this is right?

TL;DR
Screwed up, drained all the brake fluid, bled them in INPA and reset bite in ISTA, but cant remember how they felt 6+months ago.
Appreciate 0
      09-02-2020, 01:51 PM   #2
alfazrus
First Lieutenant
97
Rep
304
Posts

Drives: 2006 e90 330i
Join Date: Oct 2012
Location: DC

iTrader: (2)

What brand of of pads do you use?
Appreciate 0
      09-02-2020, 04:14 PM   #3
Vulcan50
Captain
326
Rep
698
Posts

Drives: e92 335i
Join Date: Mar 2017
Location: Peoria, IL

iTrader: (0)

Quote:
Originally Posted by alfazrus View Post
What brand of of pads do you use?
Hawk, oem Zimmerman rotors, and stop tech lines
Appreciate 0
      09-02-2020, 05:32 PM   #4
Phil325i
Colonel
Phil325i's Avatar
United Kingdom
441
Rep
2,855
Posts

Drives: E92 325i MSport Coupe
Join Date: Apr 2012
Location: UK South East

iTrader: (1)

Garage List
Vulcan you may find this of interest:

__________________
E92 pre-LCI 325i - Ohlins R&T; H&R spacers; M3 strut brace; Swift thrust sheets; 3 x chassis braces; diff brace; N53 V-brace; 034 subframe inserts; BMS clutch stop; BMS CDV; RE g/box mounts; Delrin shift bushes; Saikoumichi OCC; Cyba scoops; BMW Perf Exhaust; HEL s/steel brake hoses; M3 rear spoiler; Recaro Sportster CSs; M3 white dash LEDs; LED Angels; LED side repeaters; BMW Perf black grille; CSL reps; SSDD carbon diffuser; Monster Wrap black roof/clear front
Appreciate 2
feuer3933.50
Volasko544.50
      09-02-2020, 05:44 PM   #5
Vulcan50
Captain
326
Rep
698
Posts

Drives: e92 335i
Join Date: Mar 2017
Location: Peoria, IL

iTrader: (0)

Quote:
Originally Posted by Phil325i View Post
Vulcan you may find this of interest:

Thanks, I did that. It helped tremendously, but I just don't know if it's all the way there (if that makes sense).
Appreciate 0
      09-03-2020, 04:07 PM   #6
Vulcan50
Captain
326
Rep
698
Posts

Drives: e92 335i
Join Date: Mar 2017
Location: Peoria, IL

iTrader: (0)

So I drove another and the brakes were much "tighter." So I'm going to rebleed and see were I end up. I have a better laptop setup than last time so maybe that helps.

I remember hearing you can bleed with ISTA, is it any better/different than bleeding with INPA?
Appreciate 0
      09-03-2020, 05:01 PM   #7
bluewater328
Colonel
United_States
573
Rep
2,052
Posts

Drives: 2011 bluewater 328i LCI sedan
Join Date: Aug 2010
Location: Hawaii

iTrader: (0)

Quote:
Originally Posted by Vulcan50 View Post
So I drove another and the brakes were much "tighter." So I'm going to rebleed and see were I end up. I have a better laptop setup than last time so maybe that helps.

I remember hearing you can bleed with ISTA, is it any better/different than bleeding with INPA?
To my recollection, no. Just a little different and I seem to remember ISTA being more picky in letting you know if you should be doing it over. That said I've probably forgotten more than I remember.
Appreciate 0
      09-03-2020, 06:58 PM   #8
Biginboca
Colonel
Biginboca's Avatar
2847
Rep
2,341
Posts

Drives: 2009 E92 328i 6MT
Join Date: Jun 2017
Location: Boynton Beach, FL... USA

iTrader: (3)

Quote:
Originally Posted by Phil325i View Post
Vulcan you may find this of interest:

Ok now I want to do that! My laptop died I wonder if I can do this with the pro tool
Appreciate 0
      09-03-2020, 09:49 PM   #9
Vulcan50
Captain
326
Rep
698
Posts

Drives: e92 335i
Join Date: Mar 2017
Location: Peoria, IL

iTrader: (0)

Quote:
Originally Posted by bluewater328 View Post
To my recollection, no. Just a little different and I seem to remember ISTA being more picky in letting you know if you should be doing it over. That said I've probably forgotten more than I remember.
I'll try it, I don't mind picky if it works!

Is a power bleeder specifically necessary? I don't wanna buy something that I just end up having to store somewhere.
Appreciate 0
      11-18-2020, 02:05 AM   #10
Vulcan50
Captain
326
Rep
698
Posts

Drives: e92 335i
Join Date: Mar 2017
Location: Peoria, IL

iTrader: (0)

I have been swamped with work, school, and house renovations. But while doing the brakes on our truck I figured out, what I'm confident is the problem. I had my wife pump the brake pedal, while I watched bubbles in the drain tube with the one way valve.

Well, what I saw was bubbles going right back up the tube. So much for a one way valve.

Once I get time to rebleed, I'll follow up.
Appreciate 0
      11-18-2020, 09:11 AM   #11
Phil325i
Colonel
Phil325i's Avatar
United Kingdom
441
Rep
2,855
Posts

Drives: E92 325i MSport Coupe
Join Date: Apr 2012
Location: UK South East

iTrader: (1)

Garage List
Quote:
Originally Posted by Vulcan50 View Post
I have been swamped with work, school, and house renovations. But while doing the brakes on our truck I figured out, what I'm confident is the problem. I had my wife pump the brake pedal, while I watched bubbles in the drain tube with the one way valve.

Well, what I saw was bubbles going right back up the tube. So much for a one way valve.

Once I get time to rebleed, I'll follow up.
Don't forget the ABS unit valves all need bleeding. Do you have access to the software for this..?
__________________
E92 pre-LCI 325i - Ohlins R&T; H&R spacers; M3 strut brace; Swift thrust sheets; 3 x chassis braces; diff brace; N53 V-brace; 034 subframe inserts; BMS clutch stop; BMS CDV; RE g/box mounts; Delrin shift bushes; Saikoumichi OCC; Cyba scoops; BMW Perf Exhaust; HEL s/steel brake hoses; M3 rear spoiler; Recaro Sportster CSs; M3 white dash LEDs; LED Angels; LED side repeaters; BMW Perf black grille; CSL reps; SSDD carbon diffuser; Monster Wrap black roof/clear front
Appreciate 1
FCobra942673.50
      11-19-2020, 09:18 AM   #12
Volasko
Colonel
Volasko's Avatar
Canada
545
Rep
2,455
Posts

Drives: 2006 E90 330i BSM 6MT
Join Date: Dec 2010
Location: Toronto

iTrader: (2)

Garage List
Quote:
Originally Posted by Phil325i View Post
Vulcan you may find this of interest:

Where. The. #$@%/. Has. This. Video. Been. All. My. Life!

I've done so much brake work over the live of my vehicle and never new this process existed. I've always been fighting with all sorts of crap to get my pedal to tighten up and never even knew this procedure was even a thing until now. Now I gotta figure out how to get ISTA on my laptop!

Last edited by Volasko; 11-23-2020 at 10:24 AM..
Appreciate 0
      11-19-2020, 09:44 AM   #13
Vulcan50
Captain
326
Rep
698
Posts

Drives: e92 335i
Join Date: Mar 2017
Location: Peoria, IL

iTrader: (0)

Quote:
Originally Posted by Phil325i View Post
Quote:
Originally Posted by Vulcan50 View Post
I have been swamped with work, school, and house renovations. But while doing the brakes on our truck I figured out, what I'm confident is the problem. I had my wife pump the brake pedal, while I watched bubbles in the drain tube with the one way valve.

Well, what I saw was bubbles going right back up the tube. So much for a one way valve.

Once I get time to rebleed, I'll follow up.
Don't forget the ABS unit valves all need bleeding. Do you have access to the software for this..?
Yep, I did that and didn't get a good result. Now I know I still have a bunch of air in the lines
Appreciate 0
Reply

Bookmarks

Tags
bled, bleed, brakes, inpa, ista, pedal

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 -5. The time now is 12:05 AM.




e90post
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, vBulletin Solutions Inc.
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