Brakes will not pressurize after replacing the brakes

Tiny
CMCCLAMMA
  • MEMBER
  • 2015 CHEVROLET SONIC
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 80,000 MILES
My car started shuddering when pressing the brakes. So, I changed the pads and rotors. The calipers appeared to be okay but after about fifty miles they became stuck, so I replaced them too. I've bled them numerous times, there's no air in the tube. It's all solid brake fluid. I've even bled the back ones too. I also switched the calipers thinking maybe I installed them on the wrong side. I bled them again and I still don't have any brakes. After the bleeder valves are tight and the fluid topped off and I start the car they go straight to the floor. What am I missing?
Friday, April 22nd, 2022 AT 9:02 PM

3 Replies

Tiny
SQM
  • MECHANIC
  • 6,383 POSTS
Hello,

This ABS system requires a scan tool to bleed properly.

Here is a helpful video on how to bleed the ABS system:

https://youtu.be/nQRnKyVyMuQ

I have attached the procedure below.

Let me know of any questions.
Thank you.
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Saturday, April 23rd, 2022 AT 11:36 AM
Tiny
CMCCLAMMA
  • MEMBER
  • 25 POSTS
After being very irritated because I drove 30 minutes to AutoZone to get a loaner ABS bleed scan tool, they gave me the wrong one. I asked the guy three times if it bled the ABS module. Anyways, I decided I was going to drive the car to see just how bad the brakes were. In the driveway they would go to the floor. But while driving they weren't quite that bad but close. And definitely worse than before the new pad's, rotors and calipers. Could this still be from needing to bleed the ABS?
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Saturday, April 23rd, 2022 AT 5:22 PM
Tiny
SQM
  • MECHANIC
  • 6,383 POSTS
Yes, typically if the ABS does not get bled with the Scan tool it will impact the pedal travel. It usually feels like there is air in the line as the calibration is off.
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Sunday, April 24th, 2022 AT 1:45 PM

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