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After replacing all four brake calipers the brake pedal goes to the floor

Tiny
ROBERTCRAWFORD
  • MEMBER
  • 2007 CHEVROLET IMPALA
  • 3.5L
  • V6
  • 2WD
  • AUTOMATIC
  • 140,000 MILES
I just replaced all four brake calipers and bled all brakes several times. No air in the lines, no brake fluid leak, the brake booster is fine. The master cylinder is fine. The old calipers worked perfectly the pedal goes to the floor only when running.
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Monday, July 4th, 2022 AT 1:27 PM

1 Reply

Tiny
SQM
  • MECHANIC
  • 6,383 POSTS
Hello,

These ABS systems require a scan tool to bleed the brake system properly.
As air usually gets trapped in the valves of the ABS system and to get the air out you will need to use a scan tool to open and close the valves.
Take a look at his helpful video, it shows the process:

https://youtu.be/nQRnKyVyMuQ

I have attached the vehicle specific bleeding procedure below for your reference.

Let me know of any questions.
Thank you.
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Tuesday, July 5th, 2022 AT 8:57 AM

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