Question about Cadillac DeVille

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REPLACED FRONT AND BACK BRAKES ON VEHICLE. HAD ROTORS MACHINED AND PUT BACK ON THE VEHICLE ALONG WITH NEW BRAKE PADS. THE ENTIRE CAR SHAKES WHEN I APPLY THE BRAKES AT SPEEDS IN EXCESS OF 15 MILES PERR HOUR. THE SHAKING IS NOT IN THE STEERING WHEEL. THINKING IT WAS A FRONT END PROBLEM I REPLACED THE FRONT ROTORS AND PADS AGAIN. BEFORE I REPLACE THE REAR ROTORS AND PADS WHAT COULD STILL BE CAUSING THE PROBLEM.

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  • battle8383 Jun 27, 2009

    THIS ANSWER WAS ALREADY IN THE SYSTEM. I WOULD LIKE ANOTHER OPINION TO MY QUESTION. COULD THE REAR BRAKES BE CAUSING THE PROBLEM?

  • battle8383 Jun 27, 2009

    How can the rear brakes affect the shaking I described earlier.?

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2 Answers

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  • Cadillac Master
  • 2,200 Answers

Hi,

This is an extremely annoying problem especially as you have already replaced the components most likely to be causing it. A few quite often undervalued issues can be causing the symptoms you describe.

1) Despite the fact that you have had the rotors machined they can sometimes retain the slightest of buckles which is enough to cause this problem. Shops are good at machining the surfaces smooth to prevent pad wear but often ignore the rotation of the disk as an issue. In other words they may have been under engineered.

2) Bad bushings in the front A frame. Dependant on the vehicle bushings play a surprisingly important role in the stability of the vehicle and often loose/worn bushings translate themselves into vibration in the brakes when applied.

3) Have you had the tyres rotated? Rotors can be warped when the wheels are over torqued during the rotation process.

4) Seized calipers or improper caliper operation - (especially if this occurs on one side of the vehicle only) can cause this problem to appear.

5) Loose wheel bearing is also a cause but should also show symptoms not related to braking.

6) Weak suspension dampers or springs - a common cause of brake vibration.

Any of these issues can cause the symptoms you describe and each will need to be checked before a proper diagnoses can be made.

I hope this answer has been of some help to you. Please rate accordingly.

Posted on Jun 27, 2009

  • Radio Code Pro
    Radio Code Pro Jun 27, 2009

    It is entirely possible that the rear rotors are causing the car to shake in exactly the same way that the front rotors will i.e warped rotors causing the calipers to vibrate and feeding up through the chassis. Again worn rear suspension or bushings can contribute to the problem in exactly the same way.



    This is further indicated by the fact that you are not experiencing any feedback of this vibration through the steering wheel and does indeed point towards a problem at the back which may be causing a general vibration to be sent through the chassis.

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  • Expert
  • 60 Answers

Hello,

ABS brakes do pulse. If that is not what you are detecting you can getthe error codes. Many Auto parts stores will have loaner meters forfree. Cadillacs have lots of sensors.
Anti-lock brakes have sensors to control braking which could be the problem.

If this car has a StabiliTrak chassis then it willhave a continuously variable road-sensing suspension with a fast-actingvariable dampers, integrated rotary sensors to measure body and wheelpositional changes due to varying road conditions.

This car does have recalls you can check.

Last resaults try changing all the break fluid get it done right withthe BG44 PROFESIONALS Problem: Brake fluid becomes oxidized andcontaminated over time and use. Heat and moisture cause corrosion onparts and brake fluid failure. This causes a spongy brake pedal andshows up in discolored brake fluid.Solution: The entire brake system is inspected for leaks, mastercylinder corrosion, worn pneumatic parts, harmful varnish build-up,broken or rusted bleeder valves, worn rotors and drums and air in thebrake lines. All old brake fluid is replaced with BG Heavy Duty DOT 3or DOT 4 Brake Fluid. The result will be a longer lasting, moreefficient and safer braking system.http://www.bgfindashop.com/bgservices/brake.htm

Cheers!
Ryan

Posted on Jun 27, 2009

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Why does it shake whenever i let off the gas and shakes real bad when i apply my brakes


If when applying the brakes the steering wheel shakes then your front rotors are warped and at the least need resurfaced and most likely the brake pads replaced. But more likely the rotors are too thin which has allowed them to overheat and warp which causes the shaking. In this case new rotors and pads are in order. If when braking tou feel the shaking in the seat of your pants then most likely the rear brakes are the issue. Same problem as the front, warpage, but your rear brakes are most likely drums. Again, possible resurfacing and new shoes; but more likely new drums and brake shoes.

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