Question about Cadillac DeVille

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Hello I have a 2000 CADILLAC DEVILLE. The problem that I am experiencing is when I go to brake, there is like a....vibrating pump in the brake pedals. I thought it was the brakes so had brakes and rotors (front replaced) when got car back from shop I noticed was doing same thing as when I took it. I figured it prob needed to break in a little, but then it went on for the whole week. I take car back to shop they call me back and say that it could be the ABS system and that it is normal. UH NORMAL??? NO SIR NO MAAM!! My brake pedal pumping or making a grinding noise when I go to slow down IS NOT NORMAL! Suggestions please.

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  • Contributor
  • 14 Answers

You may need a new brake boost or you have air in the lines

Posted on Apr 05, 2017

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6ya6ya
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Posted on Jan 02, 2017

  • 5 Answers

SOURCE: i replaced front brake pads on my 05 plate volvo v70 sport d5

hey log on to www.2carpros.com and click how to change brake pads it explains everything there.

Posted on Apr 02, 2009

  • 3600 Answers

SOURCE: 99' Audi A6 2.8 Q no brakes, low to no pedal pressure...

Not likely the ABS pump there is something wrong with the mechanical brakes it sounds like the emergency brake is not adjusted try adjusting the rear cable first then pull the emergency brake and push your foot on the brake if it is still to the floor you have a problem with a cylinder or a mechanical adjustment, if it's higher with the E brake on then you have the adjusters not set right and the cables not adjusted, So adjust the cables first. If the brakes are spongy with the engine off then it will need to be power bleed if that does not fix it then you may have the wrong brake shoes or pads on the car. Did you install the plates in the wheel rotor front braes? If not you lose 1/4 inch travel on the from pads, if the basic brakes are not right the ABS side is not going to be right so those problems have to be dealt with first. Also DO YOU HAVE A POWER ASSIST BOOSTER IF SO IT COULD BE BAD, TO TEST HAVE SOMEONE STEP ON THE BRAKE PEDAL AND PULL THE HOSE OFF THE BRAKE BOOSTER IT'S behind the master cylinder (sorry for the caps) if you don't here a suction sound when you remove the hose then you have a bad heck valve by the booster connected to the hose that plugs into the booster. if all of this is ok then it may be the ABS booster but normally its a bleeding problem. write a comment if this does not help or you need another lead,

Posted on Jun 19, 2009

MNfisherman
  • 11896 Answers

SOURCE: ABS Pump "Chirping" Alarm?

EIther the ABS pump is bad and will have to be repaired by the dealer or specialy licensed ABS mechanic, or you can do what I do and pull the ABS fuse under hood and not use them.

Posted on Aug 05, 2009

Testimonial: "Prompt and helpful responses!"

  • 370 Answers

SOURCE: ABS light is on. Spongy pedal. ABS pump makes

if the abs pump is making noise you either have an air pocket in it or a bad pump, so this is what you need to do have the car pluged in to a modis and have them run a bleeder program, this will make the pump bleed the air from the system, the problem with doing some of this maintanance at home is sometimes you need specialty tools to do the job right this requires a $8,000.00 computer to make sure the air is purged from the system. call a shop and ask them what they will charge to do this. my shop where i work would charge around $25.00 to run this with the modis...
good luck

Posted on Aug 24, 2009

Testimonial: "THANKS SO MUCH. I'LL GIVE IT A SHOT. $25 BEATS $125 ANYDAY:)"

  • 200 Answers

SOURCE: brake pedal has alot of

The air seeping is a dead giveaway. Your power brakes are now manual brakes, but stiffer. The diaphram in the brake booster has torn and the hissing noise is the engine vacuum escaping (you hear it louder when you depress the pedal right?). Replace the booster and you will be fine. The brake lights probably don't work because you can't push the pedal down far enought to release the switch. Please rate. Thanks.

Posted on Sep 03, 2011

Testimonial: "I am grateful for your help.I was told so by a mechanic that it was brake booster diaphram or abs pump.pedal has so much pressure and hissing."

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