2003 Lincoln Navigator brakes

2003 LINCOLN NAVIGATOR
140,000 MILES • V8 • 4WD • AUTOMATIC
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GUERO1
  • MEMBER
  • 1 POST
2003 LINCOLN NAVIGATOR
I'eve change the master cylinder, bleed the 4 calipers and the master cylinder checked the brakes fluid lines and no leaking, and the brake pedal still goes to the floor slowly, even if I pump the pedal two or three times stay up a second and then goes down slowly again, what do you think it is?
Feb 22, 2015 at 7:49 PM
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JACOBANDNICKOLAS
  • CERTIFIED EXPERT
  • 110,175 POSTS
I hate to say it, but either you have air in the system, a leak, or got another bad master cylinder.

Take a look at the flow chart for problems and let me know if anything on it helps. NOTE: This flow chart is direct from Mitchell / Snap-on.

Also, let me know if and how you bench bled the MC as well as if you did it on the vehicle. Also, did you start at the wheel furthest from the MC and work your way to the closest?
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Feb 22, 2015 at 8:49 PM
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JACOBANDNICKOLAS
  • CERTIFIED EXPERT
  • 110,175 POSTS
Let me try the pic again. If it doesn't work, it won't let me. However, I can tell you that listed under the pedal going slowly to the floor were the following:

Check for external and internal leaks in the system.
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Feb 22, 2015 at 8:51 PM
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