1999 Ford Explorer Brakes on when engine is off -pedal goes

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TOMMY35745
  • MEMBER
  • 1 POST
Brakes problem
1999 Ford Explorer V8 Four Wheel Drive Automatic 120ooo miles

my ford explorer has good brake press, while the engine is off,as soon as its turned on,the pedal goes all the way to the floor.i have bleed them several times and there are no leaks in the system.cant find any vacuum lines that are disconnected.seems like the trouble is is the boost motor. how can i check this.i'm an excellent mechanic and rebuild cars all the time,but a little rusty on ford brake systems.but have never sent a car out to a mechanic.please give me some trouble shooting advice.i have repair many cars before going by your advice - you guys are really the best - thanks for and help you can throw my way- i have all the special tools and knowledge.thank you so much.you people are saints when it comes to helping people from the rip off garage mechanics.
Jun 4, 2010 at 2:41 PM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
The brake master cylinder could be leaking internally due to wear on seals and cups or a problem with the ABS unit
Jun 4, 2010 at 2:45 PM
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