THIS TRUCK IS A 6

  • Tiny
  • rlewis1945
  • 2008 Ford F-250
  • 50,298 miles

This truck is a 6.4L diesel with hydro-boost brakes. The power steering works fine. If I hit the brakes it stops fine. However, if the brake pedal is pushed down hard the pedal will gradually sink to the floor. With the key off the pedal never sinks to the floor. If I hold the pedal down hard and start the motor the pedal drops right to the floor. What's wrong?

Tuesday, October 16th, 2012 AT 7:10 PM

1 Answer

  • Tiny
  • hmac300
  • Expert
  • 42,050 posts

Soundslike the master cylinder is bad or air in system.

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Tuesday, October 16th, 2012 AT 7:53 PM

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