Brake pedal started going to the floor

Tiny
36JOHN
  • MEMBER
  • 2003 FORD TAURUS
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 90,000 MILES
The brake pedal started going to the floor( evidence of leakage from rear of master cylinder also), so I replaced the master cylinder( I bench bled it) The problem continued so I replaced it one more time. Same thing. When the engine is off I can pump the brakes up to a good height and pressure. As soon as the engine is stared the pedal falls to the floor. No leaks were detected around the wheels.
Sunday, February 21st, 2010 AT 6:30 PM

2 Replies

Tiny
BMRFIXIT
  • MECHANIC
  • 19,053 POSTS
Hello,

This is common when the ABS system needs to be bleed as well you will need a scanner that can open the ABS valves to allow the air out. Here is a guide as well.

https://www.2carpros.com/articles/brake-pedal-goes-to-the-floor

Please run down this guide and report back.
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Monday, April 5th, 2021 AT 12:02 PM
Tiny
PPINNETTI
  • MEMBER
  • 7 POSTS
Had to get the ABS valves opened worked great!
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Monday, April 5th, 2021 AT 12:02 PM

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