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Bench bled Master cylinder and bled the brakes pedal still goes to the floor.

Tiny
BECKYNKEN17
  • MEMBER
  • 2000 GMC SONOMA
  • 4.3L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 108,000 MILES
Changed master cylinder, replaced brake lines. Bench bled master cylinder and bled the brakes pedal still goes to the floor.
Sunday, September 5th, 2021 AT 4:03 PM

5 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,310 POSTS
Hi,

If you bench-bled the new master cylinder and all wheels, chances are air got into the ABS module. What you likely need to do is perform an automated bleed. You will need a scan tool that can perform this procedure.

I attached the directions below. The first part explains to do what you have already done, bleed the brakes. The second part is the automated bleed procedure.

Take a look through this and let me know if you have other questions.

Take care,

Joe

See pic below.
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Sunday, September 5th, 2021 AT 7:57 PM
Tiny
BECKYNKEN17
  • MEMBER
  • 5 POSTS
I already bought two scanners and both said they were capable of doing the auto bleed. I am not going to be buying another one! Next!
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Sunday, September 5th, 2021 AT 9:39 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,310 POSTS
I'm not sure I understand. Are you able to return them?
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Monday, September 6th, 2021 AT 6:47 PM
Tiny
BECKYNKEN17
  • MEMBER
  • 5 POSTS
The point is I am not doing it with a scan tool. I will find a way to bypass the ABS if that is the case.
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Monday, September 6th, 2021 AT 7:55 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,310 POSTS
Hi,

I understand. Let me know if I can help in any way.

Take care,

Joe
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Monday, September 6th, 2021 AT 9:20 PM

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