frontend shimmy
Cadillac
 

Cadillac Forums | Help Us Help You | Advertise | Cadillac Parts | Cadillac News | Cadillac Classifieds / (Old System)

Cadillac Technical Archive | Cadillac Dealers | Cadillac Reviews | Cadillac Dealer Reviews | Cadillac Vendors

CadillacForums.com is the premier Cadillac Forum on the internet. Registered Users do not see the above ads.
+ Reply to Thread
Results 1 to 4 of 4
Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, frontend shimmy in Past Cadillac Vehicle Discussion; Can someone tell me what would make my 2003 deville shimmy violently when braking at high speeds. I'm not a ...
  1. #1
    JimmyPat is offline Cadillac Owners Member
    Automobile(s): 03 deville base
    Join Date
    Apr 2012
    Age
    61
    Posts
    4

    frontend shimmy

    Can someone tell me what would make my 2003 deville shimmy violently when braking at high speeds. I'm not a mechanic but i think it must be the rotors. I had then replaced 7 months ago probably 6000 miles. Thanks, JimmyPat

  2. Remove Advertisements
    CadillacForums.com
    Advertisements
     

  3. #2
    Italia deville's Avatar
    Italia deville is offline Cadillac Owners Fanatic
    Automobile(s): 1998 deville
    Join Date
    Feb 2013
    Location
    Myrtle beach
    Age
    26
    Posts
    160

    Re: frontend shimmy

    Maybe sway bar links

  4. #3
    JimD is offline Cadillac Owners Connoisseur
    Automobile(s): '98 STS (RIP @ 206,xxx), '04 DTS & the witch driver gone.
    Join Date
    Sep 2003
    Location
    Atlanta area
    Posts
    4,686

    Re: frontend shimmy

    Quote Originally Posted by JimmyPat View Post
    Can someone tell me what would make my 2003 deville shimmy violently when braking at high speeds.
    The single most common cause of shudder/shaking/shimmy when braking from high speeds is the (impossible to see) uneven distribution of brake pad material on the surfaces of the rotors. That uneven distribution can result from many different driving patterns but the easiest one to visualize is braking for an Interstate exit ramp and having to clamp the pads to rotors at the end of the ramp waiting for a traffic signal to cycle green for you. The (hot) pads are in firm contact with the (hot) rotors as the now stationary rotors cool down. Result equals pad material transfer to the rotors as you wait for the green light with your foot on the brake pedal.

    An easy (free) method of eliminating the uneven pad material distribution is to build up some serious heat in the pads and rotors without coming to a complete stop during the process.

    Try this as a test and possible/probable solution; on a lightly travelled (safe) stretch of rural highway, make a hard brake application from ~~45 MPH down to barely moving without invoking ABS or coming to complete stop. Repeat 10 times as quickly as possible. After the 6th or 7th hard brake application, your pads and rotors 'should be' hot enough to generate smoke and the aroma of hot brake pads. That is a GOOD sign.

    Without coming to a complete stop, drive the car for several minutes to allow some cooling. Then park the car for 30 to 60 minutes and do not set the Park brake.
    I'm not a mechanic but i think it must be the rotors. I had then replaced 7 months ago probably 6000 miles. Thanks, JimmyPat
    I shudder to think about how many rotors have been replaced when replacement was totally unnecessary.

  5. #4
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
    Join Date
    Jun 2004
    Location
    Woodstock Ill.
    Age
    66
    Posts
    72,329

    Re: frontend shimmy


    Assuming you are talking about "brake judder" or vibration", here's the explanation. A true "shimmy" is something else.
    http://www.stoptech.com/technical-su...nd-other-myths

    If Jim's procedure doesn't help, having the rotors trued with a light skim cut will do the trick (assuming that's what the problem is).

Quick Reply Quick Reply

Register Now

Please enter the name by which you would like to log-in and be known on this site.
If you do not want to register, fill this field only and the name will be used as user name for your post.

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

Please enter a valid email address for yourself.

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Bookmarks

Cadillac Posting Rules

  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts
Read about Lincoln | Buick | Kia Forte Forum
Need products for your Cadillac? Check out your options at the links below:

custom floor mats | Cadillac Chrome and Black Chrome Wheels | window tinting