brakes still jumpy; need help! - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

Reply
 
 
 
Thread Tools Search this Thread
Old 08-24-2004, 01:10 PM   #1
Senior Member
True Car Nut
Thread Starter
 
Join Date: Jun 2004
Location: Glendale, AZ
Posts: 3,459
Thanks: 0
Thanked 1 Time in 1 Post
big_news_1 is on a distinguished road
Default brakes still jumpy; need help!

a couple months ago my brakes were making the car shake something vicious slowing down from 60+. i got the rotors turned, cause the guy at the shop said they still had 50k miles left in them. i put the rotors back on, along with new pads, and stopping was silky smooth for a month and a half. now, as of a couple weeks ago, the wheel is shaking coming down from high speeds again. what'* the deal? is there any way a rotor could be warped? are my alloy wheels buggered up from years of tightening my lugs with an air wrench (i just found out when i did the brakes that you're supposed to use a torque wrench and do them evenly)? help is appreciated.
big_news_1 is offline   Reply With Quote
Old 08-24-2004, 01:14 PM   #2
Junior Member
Posts like a Ricer Type-R
 
Join Date: Aug 2002
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
willwren is on a distinguished road
Default

You have warped rotors. Turning is only a temporary fix. You'll continue to warp rotors unless you somehow fix your wheels so the lugs are mating to the rim right, and use a torque wrench, following the procedure in Techinfo, Specifications.

If you have uneven torque on a Bonneville, you WILL warp rotors in time, especially hot weather. Once they're warped, turning will only buy you a very limited amount of time.
willwren is offline   Reply With Quote
Old 08-24-2004, 01:18 PM   #3
Senior Member
True Car Nut
Thread Starter
 
Join Date: Jun 2004
Location: Glendale, AZ
Posts: 3,459
Thanks: 0
Thanked 1 Time in 1 Post
big_news_1 is on a distinguished road
Default

thanks for the info, i really appreciate it. so i'm gonna get some new rotors, but i have 2 questions: 1.do you think my 2 month-old pads are now screwed up and i will need new ones again? 2.do you recommend a brand of rotors? thanks.

-ben
big_news_1 is offline   Reply With Quote
Old 08-24-2004, 01:42 PM   #4
Junior Member
 
Join Date: Mar 2003
Location: Purgatory
Posts: 0
Thanks: 0
Thanked 0 Times in 0 Posts
vital49 is on a distinguished road
Default

Quote:
Originally Posted by big_news_1
thanks for the info, i really appreciate it. so i'm gonna get some new rotors, but i have 2 questions: 1.do you think my 2 month-old pads are now screwed up and i will need new ones again? 2.do you recommend a brand of rotors? thanks.

-ben
Whenever you install new rotors you need to change the pads too. That way both mating surfaces are clean, and free of grooves. Grooves in the old pads will affect the braking performance if you reuse them with new rotors.

As for a brand of rotor... Contrary to most on here, I just use the cheapies from AutoZone or Advance. The $20 each rotors work just fine for me and I typically get 50,000 out of them before they warp. A lot of it depends on your driving habits (i.e. hard, fast stops, etc.)
vital49 is offline   Reply With Quote
Old 08-24-2004, 05:59 PM   #5
Senior Member
Posts like a Corvette
 
Ol' Timer's Avatar
 
Join Date: Oct 2002
Location: New Jersey - Most of Our Elected Officials Have Not Been Indicted
Posts: 1,483
Thanks: 0
Thanked 0 Times in 0 Posts
Ol' Timer is on a distinguished road
Default

Also, it'* a good idea to clean and put some new silicone grease on those caliper slide bolts so the calipers moves freely.
Ol' Timer is offline   Reply With Quote
Old 08-24-2004, 08:11 PM   #6
Junior Member
Posts like a Ricer Type-R
 
Join Date: Aug 2002
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
willwren is on a distinguished road
Default

And don't forget to lube the back of the pads. I agree, 2 months on warped rotors would dictate that your pads are garbage. If it had been a week or two, simply scoring them with 60-grit sandpaper would work, but yours will be too far gone.

The rotors you buy will be based on your climate (heat in the summer) driving conditions (hilly or flat) and driving style (like me? Or like 'Ol Timer). Fill us in. If you drive conservatively, with a moderate climate, and no hilly driving very often, good 'cheapie' rotors should be find for you. But you should take some precautions.

1. Clean off the face of the hub with a stiff wire brush and some brake cleaner. Get all the scale, rust, and debris off.

2. Do the same to the back of the wheels, but use a BRASS brush for the aluminum wheels.

3. Make sure you de-burr any damaged lug sockets on the wheel from your impact wrench work.

4. Thoroghly clean all the lug studs, so that there'* no debris in the threads.

5. Put a drop of ANY kind of oil on each stud before installing the lugnut. This will help in achieving even, consistent torque.

6. Torque in the typical 'stagger' or 'star' sequence. First to 50 ft/lbs, then to 75 ft/lbs, then finally to 100ft/lbs. Don't use the cheapie torque wrench. Use a 'clicker'.

If you follow these steps, your rotors will have a much higher chance of survival.
willwren is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Jumpy Tach Needle on a 94 Bonny SE FireCapt.421 1992-1999 6 08-18-2010 08:48 PM
Jumpy Temperature Guage tosh 1992-1999 4 10-25-2007 10:02 AM
Jumpy or Studdering when going up hills dewinwGod12 2000-2005 12 07-03-2006 08:17 PM
Jumpy Cruise Control macho_mike21 1992-1999 15 06-07-2003 02:26 AM
Brakes Brakes Brakes Terran 2000-2005 11 04-27-2003 11:28 PM


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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 01:10 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.