Why do my Brakes go to floor when engine running

Asked by Amy Jul 21, 2020 at 03:26 PM

Question type: Maintenance & Repair

My 1999 Ford F150 6 cylinder just got
new pads and work on the calipers
done. Bled the brakes and they built up
pressure but as soon as I started it up
the brakes failed and the pedal goes to
the floor. I can pump them, having to
manually raise the pedal up and get
some pressure to barely stop it.

1 Answer
315

jnebeker75 answered 4 years ago

with your motor off pump up the brakes till the pedal gets stiff, while holding your foot on the pedal you just pumped up start your truck if the pedal goes all the way to the floor good chance you have a bad power booster.

Mark helpful

Your Answer:

Related Questions

  • Why do my Brakes go to floor when engine running 1 Answer

    My 1999 Ford F150 6 cylinder just got new pads and work on the calipers done. Bled the brakes and they built up pressure but as soon as I started it up the brakes failed and the pedal goes to the...

    Maintenance & Repair

  • Why do my Brakes go to floor when engine running 2 Answers

    My 1999 Ford F150 6 cylinder just got new pads and work on the calipers done. Bled the brakes and they built up pressure but as soon as I started it up the brakes failed and the pedal goes to the...

    1999 Ford F-150

    -

    Maintenance & Repair

  • Why do my brakes go to the floor? 4 Answers

    I noticed my brake light had come on and brakes began to not work so well. It was really slow to stop. I replaced the master cylinder then noticed fluid squirting out near the rear right side. It wa...

    2005 Chrysler Town & Country Touring LWB FWD

    -

    Maintenance & Repair

  • Why do my brake pedal go to the floor 2 Answers

    I’ve replaced master cylinder brake booster and pads and rotors any suggestions to why brake pedal goes to the/ sounds spongy

    2001 Lincoln Town Car Executive

    -

    Maintenance & Repair

  • F-150 brakes solid when engine off, but go to the floor when on. 1 Answer

    2014 Ford F-150. Part of master cylinder recall. Have replaced the master cylinder 2X. Checked the Power booster, not an issue. Checked the ABS modulator, it is fine. When I push the brake with engi...

    2014 Ford F-150 FX4 SuperCrew 4WD

    -

    Maintenance & Repair

Shortcuts

Search Maintenance & Repair Questions

CarGurus Experts

  • #1
    Gene Arnett
    Reputation
    246,920
  • #2
    Rowefast
    Reputation
    186,130
  • #3
    dandyoun
    Reputation
    170,300
View All

Find great deals from top-rated dealers

Search

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use. Content will be removed if CarGurus becomes aware that it violates our policies.