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I am guessing here. Inspect the shocks for a broken one. Could also be a suspension part that is defective. You need to inspect the suspension, exhaust system, and brake system. Also look in the trunk to make sure womething is not loose and rooling around.

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Q: What is wrong if 1999 DeVille makes a bumping sound when the brakes are applied?
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Related questions

Car makes a bumping noise when braking?

change brakes or check drums


Why would an 81 Chevy truck die when you press the brakes?

The power brake booster is leaking vacuum and that makes the engine die when the brakes are applied. Replace brake booster.


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Thunder makes a signifacent sound by the clouds bumping together.


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Your truck makes a hissing sound when your brakes are engaged and your brake peddle travels all the way to the floor before stopping the truck also stalls when brakes are engages?

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What makes a 1993 cadillac deville transmission shudder between 40 50mph on acceleration but when you tap the brakes while acceleration it stops?

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