Brake pedal goes to the floor

Tiny
THOTRODDER
  • 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.

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Saturday, November 19th, 2016 AT 3:13 PM

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Tiny
MHPAUTOS
  • EXPERT
  • 31,225 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
  • EXPERT
  • 31,225 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

It will start to fade to the floor.

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Sunday, November 20th, 2016 AT 7:41 PM
Tiny
2CARPROS KEN
  • ADMIN
  • 9,409 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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