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Why does brake pedal still go to the floor

Tiny
KEVIN GODWIN
  • MEMBER
  • 2005 FORD E-SERIES VAN
  • 150,000 MILES
Never had a brake problem all happened at once sitting at stop light brake pedal sinks to the floor. Replaced master cylinder still same problem, replaced booster still same problem. No leaks anywhere good engine vacuum. Disc front and rear. All calipers work all pads look good with even wear. No abs codes, all functional test good, did an abs bleed can not find problem.
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Tuesday, December 20th, 2011 AT 2:19 AM

7 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Recheck master cylinder for an internal leak, brake shoes on back-try adjusting it -check wheel cylinders for leakage
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Tuesday, December 20th, 2011 AT 2:45 AM
Tiny
CJ MEDEVAC
  • MECHANIC
  • 11,005 POSTS
JUST SLINGIN' THIS OUT

https://www.2carpros.com/questions/1999-ford-f-150-brakes--3

LET ME KNOW IF THIS HELPS

SOMETIMES NEW STUFF CAN BE BAD TOO!

THE MEDIC
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Tuesday, December 20th, 2011 AT 4:09 AM
Tiny
KEVIN GODWIN
  • MEMBER
  • 53 POSTS
Tried 2nd master cylinder has disc brakes on rear still goes to floor
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Friday, December 23rd, 2011 AT 2:53 AM
Tiny
CJ MEDEVAC
  • MECHANIC
  • 11,005 POSTS
IN MY LINK ABOVE YOUR LAST RESPONSE--DID YOU VIEW THE BLEEDING PROCEDURE TOWARDS THE END?

DID YOU TRY TO BLEED THE SYSTEM LIKE THIS?

IF NOT, COULD YOU DESCRIBE IN DETAIL, HOW YOU DID DO IT?

WE ARE TRYING TO HELP

YOUR TURN

THE MEDIC
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Friday, December 23rd, 2011 AT 3:03 AM
Tiny
KEVIN GODWIN
  • MEMBER
  • 53 POSTS
Bench bleed master cylinder have one person press real slow on piston with screw driver while I pinch off the hoses not letting air be induced back to cylinder this is how I have always done it usually let sit for 30 min then recheck for air bubbles sometimes you get more after you let it settle. I even tried bleeding at the wheels some thinking maybe air was induced somehow but that was not the case. I ve also done a abs bleed 5 times with my solus. And then I tried a used abs ass. I had thinking maybe a bad seal inside didnt think it would work and it didnt still same problem
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Friday, December 23rd, 2011 AT 3:17 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,875 POSTS
Is the rod that attaches to the MC adjustable?
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Friday, December 23rd, 2011 AT 4:30 AM
Tiny
KEVIN GODWIN
  • MEMBER
  • 53 POSTS
No
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Friday, December 23rd, 2011 AT 4:31 AM

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