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Replaced the Master cylinder and braking has improved, but still goes to floor when held

Tiny
THOTRODDER
  • MEMBER
  • 2009 LINCOLN
  • 3.7L
  • V6
  • FWD
  • AUTOMATIC
  • 100,000 MILES
Brake pedal goes to the floor. I replaced the master cylinder and braking has improved, but still goes to floor when held.
Saturday, November 19th, 2016 AT 3:13 PM

5 Replies

Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
Did you re-bleed the entire brake system after replacing the master cylinder?
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Sunday, November 20th, 2016 AT 12:38 AM
Tiny
THOTRODDER
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Yes.
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Sunday, November 20th, 2016 AT 4:58 AM
Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
If you pump the pedal and hold it will it stay up? Does it fall away under light pedal application?
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Sunday, November 20th, 2016 AT 12:32 PM
Tiny
THOTRODDER
  • MEMBER
  • 3 POSTS
It will start to fade to the floor.
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Sunday, November 20th, 2016 AT 7:41 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Hello,

It sounds like there is air trapped in the ABS unit and you must have a scanner to open each valve to bleed it, this does happen all the time but it does happen.

Please let us know happens so it will help others.

Best, Ken
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Tuesday, November 22nd, 2016 AT 8:04 PM

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