Brake noise 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 10-06-2002, 06:13 PM   #1
Senior Member
Posts like a Turbo
Thread Starter
 
Join Date: Jul 2002
Posts: 417
Thanks: 0
Thanked 0 Times in 0 Posts
Azwed is on a distinguished road
Default Brake noise help

Ok i need some diagnostic help.

I think one or possibly both my brake calipers are sticking. I know for sure the passenger side pads are rubbing the rotor because with that windo down i can hear the scraping very loudly. As soon as i press the breaks slightly the scraping noise goes away so I am pretty sure it is just the breakes making the noise and nothing else.


What do I need to look for on the pads, rotors and/or calipers to make sure it is the calliper sticking or freezing up? I have rebuilt the front calipers on my roommates old concorde so I am sure i can do it on the bonne if I need to.

I can't afford new callipers but can't i use the calipers from a new bonne rebuild them and put them on my 89 LE?

Any assistance would be greatly apreciated.
Azwed is offline   Reply With Quote
Old 10-06-2002, 10:34 PM   #2
Junior Member
 
Join Date: May 2002
Posts: 0
Thanks: 0
Thanked 0 Times in 0 Posts
SSEi95 is on a distinguished road
Default

I have never done a caliper rebuild before but I did look up the proccess in my maintaince manual. It actually seems fairly easy. There are only two catches. 1) You need compressed air (or possibly another method ) to force the old piston out. 2) You will need a seal driver to place the new piston with the seal back into the opening all the way.

I'm sure someone out here has done it before and can give you more insight into it but to me it looks like a faily easy task if you have the tools.
SSEi95 is offline   Reply With Quote
Old 10-06-2002, 10:50 PM   #3
Senior Member
Posts like a Turbo
Thread Starter
 
Join Date: Jul 2002
Posts: 417
Thanks: 0
Thanked 0 Times in 0 Posts
Azwed is on a distinguished road
Default

I have already rebuilt a caliper on my roommates car so I know I can do the rebuild on the calipers. I just need to know what I should look for to see if the calipers are sticking/ freezing up.

Like wear paterns on the rotors or pads.

I also need to know if the calipers from a newer bonne or Grand Prix will fit on my 89 so I can find a used caliper at the junkyard with few miles.
Azwed is offline   Reply With Quote
Old 10-06-2002, 11:37 PM   #4
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

Caliper to pad contact, if it'* not aligned, will be obvious on the back of the pad. You'll see a semicircle. Sometimes the trailing edge of the pad will be thinner than the leading edge, too.
willwren is offline   Reply With Quote
Old 10-07-2002, 10:47 AM   #5
Senior Member
True Car Nut
 
Join Date: Jun 2002
Location: Bedroom, Ontario
Posts: 3,266
Thanks: 0
Thanked 0 Times in 0 Posts
Drifter420 is on a distinguished road
Default

I'm sure you checked to ensure that when you're applying brakes that it doesn't pulsate the car.. that would say it'* a warped rotor...
Drifter420 is offline   Reply With Quote
Old 10-07-2002, 01:03 PM   #6
Junior Member
Posts like a Ricer Type-R
 
Join Date: Sep 2002
Location: Florida
Posts: 19
Thanks: 0
Thanked 0 Times in 0 Posts
Wesbo is on a distinguished road
Default

Just sounds like old, glazed pads to me. The shiny, hard surface of worn pads will squeak as the rotor just kisses them. Once you step on the brakes the pads are brought into full contact with the rotors and the noise stops.

Just for grins and giggles, take off the front pads. If they are thin enough to replace, get new ones. If not, rub them on your driveway or some 40-grit sandpaper (no, I'm not kidding) enough to knock off the shiny surface and bring up some new pad material. Don't use a pwer sander or grinder because you don't want to breathe this crap.

Put the pads back on and see if the noise goes away.

VERY often, you don't need new calipers.
Wesbo is offline   Reply With Quote
Old 10-07-2002, 07:06 PM   #7
Senior Member
Posts like a Turbo
Thread Starter
 
Join Date: Jul 2002
Posts: 417
Thanks: 0
Thanked 0 Times in 0 Posts
Azwed is on a distinguished road
Default

Thanks Wesbo I never knew that.

The rotors must be slightly warped because there is a slight vibration when I get on the breaks hard. We are talking the last 1/3 or so of the pedals travel.
Azwed is offline   Reply With Quote
Old 10-07-2002, 07:26 PM   #8
Senior Member
Posts like a Turbo
 
Join Date: Sep 2002
Location: Nj/Pa
Posts: 260
Thanks: 0
Thanked 0 Times in 0 Posts
Tonyrodz is on a distinguished road
Default

if they're warped you'll definitely feel the pulsating in the brake pedal once you step on it.
I had to get another rotor--bought aftermarket--cost was $20! Geez-around here to cut a rotor it'* $10--not much of a decision there.
Check into prices for a new rotor--can't hurt.
Also--if you do need to change a caliper-you should change your front rubber brake lines, after all if it'* all stock it is 13 yrs old-and they expand on the inside where you can't see it.
Tonyrodz is offline   Reply With Quote
Old 10-07-2002, 08:13 PM   #9
Senior Member
Posts like a Turbo
Thread Starter
 
Join Date: Jul 2002
Posts: 417
Thanks: 0
Thanked 0 Times in 0 Posts
Azwed is on a distinguished road
Default

I wonder how much stainless steel lines would be for the bonne? hmhhh.
Azwed is offline   Reply With Quote
Old 10-07-2002, 08:25 PM   #10
Senior Member
Posts like a Turbo
 
Join Date: Sep 2002
Location: Nj/Pa
Posts: 260
Thanks: 0
Thanked 0 Times in 0 Posts
Tonyrodz is on a distinguished road
Default

I'd think can't be more then $20-25 each.
i really need to change mine too--has some cracks-not good!
Tonyrodz is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Need help with possible 4L80E issue on 1500 HD - winding gear noise on coast or brake K-Rod GMC/Chevrolet Truck/SUV 4 04-05-2015 09:30 PM
Clunking noise when I go to speed up the is follows up with a light roaring noise DeathDealer General GM Chat 10 07-17-2012 05:50 PM
Reverse Noise and Turning Noise PhyreStorm 2000-2005 1 05-10-2008 01:39 AM
Noise at specific speeds, sounds like tire noise but isn't? billha 1992-1999 13 04-25-2006 02:13 AM
Brake Lines brake lines oh god brake lines disco_dotty 1987-1991 14 01-19-2005 08:38 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 11:58 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.