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When the engine is running the brake pedal goes

Tiny
FREDWS
  • MEMBER
  • 1988 LINCOLN TOWN CAR
  • 5.0L
  • V8
  • 2WD
  • AUTOMATIC
  • 125,000 MILES
Break pedal go to floor only when engine is running. I have heard pedal that is high when engine is off. I changed master cylinder. Bled all the lines. I have no leaks in system.
Thursday, June 29th, 2017 AT 10:22 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,513 POSTS
Hello,

This sounds like you have a caliper slide that is frozen. This will cause the rotor to push the pad back into the caliper making an air gap.

Here is a guide that shows the caliper slides.

https://www.2carpros.com/articles/how-to-replace-front-brake-pads-and-rotors-fwd

Please let us know what you find.

Cheers, Ken
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Friday, June 30th, 2017 AT 12:58 PM

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