Fault messages after changing brake master cylinder

2005 CADILLAC ESCALADE
200,000 MILES • 6.0L • V8 • 2WD • AUTOMATIC
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SHARJEEL LASHARIE
  • MEMBER
  • 4 POSTS
Hi,

I followed the instructions posted here to replace my brake master cylinder.
The brakes are working fine but as soon as I start the car, I get messages saying "service brake system" and "stability control disabled"

What could I have done wrong? And how can I fix it now?

Regards,
Sharjeel
Jun 11, 2017 at 8:00 PM
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MHPAUTOS
  • ✓Experienced Mechanic
  • 31,937 POSTS
i will need to know if any OBD11 codes are present. also, did you bleed the brakes correctly?
Jun 11, 2017 at 9:54 PM
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SHARJEEL LASHARIE
  • MEMBER
  • 4 POSTS
Thanks for your reply. There are no ODBII codes. I thought I bled the system well.
Jun 11, 2017 at 10:08 PM
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MHPAUTOS
  • ✓Experienced Mechanic
  • 31,937 POSTS
often this can be a bleed issue. i would go and re bleed again just to make sure and let me know what expires.
Jun 11, 2017 at 10:14 PM
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STEVE W.
  • ✓Experienced Mechanic
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Did you use a scan tool to bleed the ABS system? Any air that gets into that system will cause this.
Jun 11, 2017 at 11:28 PM
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SHARJEEL LASHARIE
  • MEMBER
  • 4 POSTS
Thank you again. I did not use a scan tool. Is normal bleeding going to get rid of the air or shall I start with bench bleeding?
Jun 12, 2017 at 3:48 PM
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SHARJEEL LASHARIE
  • MEMBER
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OK. I managed to fix it. There were probably a few air bubbles trapped in the system and I managed to get them out by braking hard and holding the pedal for ten seconds and then letting go with a snap.
I had to do that 4-5 times and then on the last time, the warning lights went out and the system came on. I checked by switching the Stability control a few times. All is well now.
Thanks for your support.
Jun 14, 2017 at 9:05 PM
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STRAILER
  • ✓Experienced Mechanic
  • 55,065 POSTS
Glad you could get it fixed, that kind of problem can be tough. Please use 2CarPros anytime we are here to help

Cheers, Ken
Jun 17, 2017 at 6:50 AM
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