When the engine is running the brake pedal goes

1988 LINCOLN TOWN CAR
125,000 MILES • 5.0L • V8 • 2WD • AUTOMATIC
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FREDWS
  • MEMBER
  • 1 POST
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.
Jun 29, 2017 at 10:22 AM
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STRAILER
  • ✓ASE Certified Mechanic
  • 54,837 POSTS
  • ASE Certified Mechanic
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
Jun 30, 2017 at 12:58 PM
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