carmudgeons.com  

Go Back   carmudgeons.com > Automotive Forums > Car Talk

Reply
 
Thread Tools Display Modes
Old 06-19-2018, 03:01 PM   #11
ff
.
 
Join Date: Mar 2004
Posts: 12,860
Quote:
Originally Posted by rumatt View Post
Does your certification allow you to drive to my house and fix my car?
I think it requires him to.
ff is offline   Reply With Quote
Old 06-19-2018, 03:14 PM   #12
rumatt
Mugwump
 
rumatt's Avatar
 
Join Date: Oct 2003
Carmudgeonly Ride: E46 330i, E91 325xi, Chevy Colorado, Cayman R
Location: NY
Posts: 16,524
Quote:
Originally Posted by zach View Post
Hmm, I'm stumped.
Well, I didn't do it yet, so....
rumatt is offline   Reply With Quote
Old 06-19-2018, 04:02 PM   #13
Josh (PA)
Hello.
 
Josh (PA)'s Avatar
 
Join Date: Mar 2004
Carmudgeonly Ride: '03 325xiT, '11 135i C, '13 X5 n55
Location: Downingtown, PA
Posts: 3,082
Quote:
Originally Posted by rumatt View Post
If I put race pads on the car, drive around for a while, and the vibration is gone then it blows a hole in the damaged caliper theory, right?
depends how they heat up and how they are worn... ie: if they are significantly thinner than your current pads, they may not drag (or drag as much) and not cause the rotors to heat.

Does it do it all the time / everytime, or only after they warm up? Does it matter how hard you press the brakes (does it get worse if you press harder or does it only start after a certain amount of pressure)? Any residual vibration not under braking?
__________________
Josh (PA) -
'11 135i convertible
'13 X5 n55
'03 325 wagon
Josh (PA) is offline   Reply With Quote
Old 06-19-2018, 05:25 PM   #14
rumatt
Mugwump
 
rumatt's Avatar
 
Join Date: Oct 2003
Carmudgeonly Ride: E46 330i, E91 325xi, Chevy Colorado, Cayman R
Location: NY
Posts: 16,524
Quote:
Originally Posted by Josh (PA) View Post
Does it do it all the time / everytime, or only after they warm up? Does it matter how hard you press the brakes (does it get worse if you press harder or does it only start after a certain amount of pressure)? Any residual vibration not under braking?
It's there all the time. Any speed, any pressure. But as you would expect, the vibrations are faster at higher speeds, and stronger under firm braking.

Braking hard at high speed sucks, and makes me curse at my rotors.
rumatt is offline   Reply With Quote
Old 06-19-2018, 05:41 PM   #15
Nick M3
Old Fart
 
Nick M3's Avatar
 
Join Date: Oct 2003
Location: Bethesda, MD
Posts: 8,748
What brake pads are you using?
__________________
2006 GMC Sierra 2500HD 4WD LBZ/Allison
2002 BMW M3
1999 323i GTS2
1995 M3 S50B32, S6S420G, 3.91
1990 325is
1989 M3

Hers:
1988 325iX
1996 911 Turbo


Nick M3 is offline   Reply With Quote
Old 06-19-2018, 06:32 PM   #16
rumatt
Mugwump
 
rumatt's Avatar
 
Join Date: Oct 2003
Carmudgeonly Ride: E46 330i, E91 325xi, Chevy Colorado, Cayman R
Location: NY
Posts: 16,524
Textar.
https://www.ecstuning.com/b-textar-p...116779652~tex/
rumatt is offline   Reply With Quote
Old 06-19-2018, 10:13 PM   #17
Terry Kennedy
There and back again
 
Terry Kennedy's Avatar
 
Join Date: Oct 2003
Carmudgeonly Ride: 2003 BMW 325xiT; looking for a new fun car
Location: New York
Posts: 2,545
Quote:
Originally Posted by rumatt View Post
It's there all the time. Any speed, any pressure. But as you would expect, the vibrations are faster at higher speeds, and stronger under firm braking.

Braking hard at high speed sucks, and makes me curse at my rotors.
I've had this forever. Dealer replaced rotors (and eventually calipers / mounting hardware) multiple times under new car warranty. Out of warranty, I tried various combinations of OEM / aftermarket rotors / calipers, and nothing fixes it 100%. I get the best results with Bavarian Autosport slotted + drilled rotors and OEM pads (had tried various aftermarket pads).

A good re-bedding clears the problem up for a while, then it comes back. So definitely not warpage - just some sort of build-up on the rotors.
Terry Kennedy is offline   Reply With Quote
Old 06-20-2018, 11:17 AM   #18
equ
Alphanumeric
 
equ's Avatar
 
Join Date: Aug 2005
Carmudgeonly Ride: 981S, 535i, macanurbo
Posts: 7,704
Installed four new rotors and pads on the f10 535i at 49k miles. It was pulsing badly and the rotors were visibly rusty. I used Zimmermann rotors and I think Textar (OEM-equivalent) pads. After a few thousand miles, the pulsing is coming back.... To top it off, I'm feeling very slight pulsing on the Boxster (at 17k miles).

Could bad roads (braking on bumps e.g.) cause issues over time? I see a commonality among Rumatt, Terry and I and that's where we live and drive.

I'm paranoid about holding down the brake pedal at a stop, will occasionally use hand brake or move car a bit to avoid hot spots.
equ is offline   Reply With Quote
Old 06-20-2018, 11:32 AM   #19
rumatt
Mugwump
 
rumatt's Avatar
 
Join Date: Oct 2003
Carmudgeonly Ride: E46 330i, E91 325xi, Chevy Colorado, Cayman R
Location: NY
Posts: 16,524
I also have Zimmerman rotors.

My theory on the commonality is that we don't drive our cars every day. My theory is that the rotors get slightly rusty from rain / humidity, but not in the spot where the pads are resting on the rotors. Driving scrapes the rust off off the rest, but the rotor is never the same from that point forward.

Should I do an experiment where I remove my brake pads every time I park the car?
rumatt is offline   Reply With Quote
Old 06-20-2018, 01:24 PM   #20
kognito
older fart than ZBB
 
kognito's Avatar
 
Join Date: Oct 2003
Location: On the road again
Posts: 6,965
Quote:
Originally Posted by rumatt View Post
Should I do an experiment where I remove my brake pads every time I park the car?
Double blind . . .you'll have to remove the rotors too
__________________
2017 GMC Sierra 1500 SLE
2016 Focus SE
kognito is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

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

Similar Threads
Thread Thread Starter Forum Replies Last Post
Brake Rotors.... lip277 Technical Superiority 3 10-14-2008 10:01 PM


All times are GMT -4. The time now is 01:27 AM.


Powered by vBulletin® Version 3.7.1
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Forums 2003-2008, 'Mudgeon Enterprises - Site hosting by AYN & Associates, LLC