Lost bite from my brakes - Ford Mustang Forums : Corral.net Mustang Forum
 
LinkBack Thread Tools Display Modes
post #1 of 12 Old 06-20-2009, 04:09 PM Thread Starter
Registered User
 
Deeds's Avatar
 
Trader Feedback: (14)
Join Date: Jan 2005
Location: IL
Posts: 568
Lost bite from my brakes

This is on my civic that I run in GS. My setup is completely stock. When the car was newer the brakes would bite hard during autox. 33K miles later and they lost most of it. I have plenty of pad left and the rotors look good. I did a bunch of hard stops, kinda like if I was bedding in a new set of pads. Didn't change the feel. What other things can I try with out spending cash? Scuff the rotors?

Deeds is offline  
Sponsored Links
Advertisement
 
post #2 of 12 Old 06-20-2009, 05:05 PM
Registered User
 
2k2GT's Avatar
 
Trader Feedback: (0)
Join Date: Aug 2002
Location: Lenoir City, TN
Posts: 6,493
I think what you're experiencing is "glazing over" of the pads. Doesn't seem like there is a cure.

What causes brake pad glazing?
Brake pad glazing is caused when the brake pad friction material is overheated.
This results in crystallized friction material on the pad surface and the brake disc.
Typical symptoms of glazed brake pads include: Poor stopping performance, vibration or brake judder, and cracks or fissures in the brake pad material.
Pad glazing is typically caused by operating the brake pads at a temperature above the specified temperature range of the friction material or not properly following the 'Bedding-in' instructions for the brake pads. Always follow the manufacturers brake pad bedding-in instructions and use a brake pad that has a temperature range that is sufficient for its intended use.

http://www.raceshopper.com/tech.shtml

2k2GT is offline  
post #3 of 12 Old 06-20-2009, 07:10 PM
Registered User
 
2ndsideways's Avatar
 
Trader Feedback: (4)
Join Date: May 2007
Location: north jersey
Posts: 463
change fluid

Must keep making progress
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
....
2ndsideways is offline  
Sponsored Links
Advertisement
 
post #4 of 12 Old 06-20-2009, 07:34 PM
MFE
Super Moderator
 
MFE's Avatar
 
Trader Feedback: (9)
Join Date: Nov 1999
Location: Phoenix
Posts: 27,649
The pads are probably glazed. You can knock the glaze off with sandpaper, but if they did it once, they'll do it again.
MFE is offline  
post #5 of 12 Old 06-21-2009, 10:48 AM
Registered User
 
Trader Feedback: (3)
Join Date: Dec 2003
Location: Atlanta, Georgia
Posts: 397
Quote:
Originally Posted by 2ndsideways View Post
change fluid
Why would you recommend changing fluid to fix a friction issue? If he complained of a soft pedal, changing the fluid would be a possible solution.

Eric Anderson
Alpharetta, GA

At Corner-Carvers, we're not happy till you're not happy
a79coupe is offline  
post #6 of 12 Old 06-21-2009, 12:32 PM Thread Starter
Registered User
 
Deeds's Avatar
 
Trader Feedback: (14)
Join Date: Jan 2005
Location: IL
Posts: 568
Quote:
Originally Posted by a79coupe View Post
Why would you recommend changing fluid to fix a friction issue? If he complained of a soft pedal, changing the fluid would be a possible solution.
Yeah..not a soft pedal issue. During my last autox I was running in the top 10 of street tire so the brakes are working. I just needed a harder grab to get thru a few corners better.
Deeds is offline  
post #7 of 12 Old 06-23-2009, 01:38 PM
Registered User
 
Trader Feedback: (3)
Join Date: Dec 2003
Location: Atlanta, Georgia
Posts: 397
If you want to use the same rotors, you can scuff them using Garnet paper. Do NOT use silicone carbide paper. The silicone carbide will embed in the iron and will create a chemical reaction when the iron is hot. It turns the rotor into a form of iron called cementite which is extremely hard and will create just the kind of friction issues you are trying to fix.

Did you ever scuff the rotors with sandpaper?

Eric Anderson
Alpharetta, GA

At Corner-Carvers, we're not happy till you're not happy
a79coupe is offline  
post #8 of 12 Old 06-23-2009, 11:04 PM Thread Starter
Registered User
 
Deeds's Avatar
 
Trader Feedback: (14)
Join Date: Jan 2005
Location: IL
Posts: 568
Quote:
Originally Posted by a79coupe View Post
If you want to use the same rotors, you can scuff them using Garnet paper. Do NOT use silicone carbide paper. The silicone carbide will embed in the iron and will create a chemical reaction when the iron is hot. It turns the rotor into a form of iron called cementite which is extremely hard and will create just the kind of friction issues you are trying to fix.

Did you ever scuff the rotors with sandpaper?
Nope..never touched them since the car was new. Can you get Garnet paper at any hardware store?
Deeds is offline  
post #9 of 12 Old 06-23-2009, 11:39 PM
Registered User
 
Trader Feedback: (3)
Join Date: Dec 2003
Location: Atlanta, Georgia
Posts: 397
Yep.

Eric Anderson
Alpharetta, GA

At Corner-Carvers, we're not happy till you're not happy
a79coupe is offline  
post #10 of 12 Old 06-24-2009, 03:21 AM
Registered User
 
2k2GT's Avatar
 
Trader Feedback: (0)
Join Date: Aug 2002
Location: Lenoir City, TN
Posts: 6,493
FWIW, I had installed a new booster on my 01 Explorer and for some reason the "shaft" i'll call it, wasn't adjusted correctly out of the box. The brakes worked, but the pedal wasn't being pushed back up as far as it was supposed to.....creating a drag on the brakes that you had to pull up with your foot(under the pedal).

Well, I guess I over adjusted it and it didn't have ENOUGH slack. So it proceeded to begin locking up the brakes on all 4 corners. I managed to drive the car home appx 10 miles so I could work on it again. All 4 wheels were smoking and smelled like brakes.

I fixed the booster, but the pads were most certainly glazed over. You could see the material cracking and discoloration on the sides of the pads from the heat.

I took out the belt sander with the pads clamped in the bench vise and went to town. This certainly got rid of the glaze and the truck stops alot more linear now. I just need a fluid bleed and it'll be back to normal.....besides the heavily worn/thin rotors.

2k2GT is offline  
post #11 of 12 Old 06-24-2009, 09:00 AM
Registered User
 
Trader Feedback: (3)
Join Date: Dec 2003
Location: Atlanta, Georgia
Posts: 397
For a street vehicle, the rotors don't typically get to the same temps as a "sporting" vehicle so the transformation to cementite will be slower. If you used regular silicone carbide paper in the belt sander, don't be surprised if you start to get some pulsing in those brakes. The rotor actually doesn't wear as much where the cementite forms and so as the rest of the rotor wears, you will have thick and thin spots creating the pulse.

Eric Anderson
Alpharetta, GA

At Corner-Carvers, we're not happy till you're not happy
a79coupe is offline  
post #12 of 12 Old 06-24-2009, 09:10 AM
Registered User
 
2k2GT's Avatar
 
Trader Feedback: (0)
Join Date: Aug 2002
Location: Lenoir City, TN
Posts: 6,493
So far so good. This is mainly just an A-to-B vehicle so I don't mind minor inconvenience or less than stellar performance. Although I did put a set of Bilstein's on it, but that was mainly due to the girlfriend(when she uses it) thinking it was gonna roll over in a corner(she's used to driving sports car types).

Last edited by 2k2GT; 06-24-2009 at 09:29 AM.
2k2GT is offline  
Sponsored Links
Advertisement
 
Reply

Bookmarks

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Ford Mustang Forums : Corral.net Mustang Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
On a positive note, lost dog reunited with owners after 4 months lost at sea >>> Gary L Lounge 2 04-06-2009 10:30 AM
wanted hpm mega bite or mega bite jr lower control arms poppa preston Suspension 2 11-16-2004 05:42 PM
Just LOST my brakes! Mysticobra96 SVT & DOHC 8 09-26-2004 09:44 AM
Mega-bite Sr. ??? human-clone Drag Racing 0 04-11-2004 11:10 PM
lost power in brakes Crazebob General Mustang Tech 1 01-20-2003 05:38 PM

Posting Rules  
You may post new threads
You may 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 On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome