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1990 Ford Bronco BRAKE PEDAL GOES TO FLOOR WHEN STARTED.

Tiny
SCOTH
  • MEMBER
  • 1990 FORD BRONCO
  • V8
  • 4WD
  • AUTOMATIC
  • 130,000 MILES
I'VE REPLACED FRONT CALIPERS, BRAKE LINES, MASTER CYL, VACUUM BLED ENTIRE SYSTEM WITH OVER 3 QUARTS OF DOT 3/4 SYNTHETIC FLUID AND HAVE NO LEAKS. THE VACUUM POWER ASSIST SEAMS TO BE O.K. THE PEDAL IS HARD WHEN NOT RUNNING.
Tuesday, May 11th, 2010 AT 3:28 PM

3 Replies

Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
Does this vehicle have RWAL (rear wheel anti-lock)? Sounds like the RABS (Rear anti-lcok brake system) valve is bypassing.I have seen a lot of these go bad, it acts just like amaster cylinder or air in the system. Even when the valve goes bad, it wont set an ABS light every time.
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Tuesday, May 11th, 2010 AT 8:49 PM
Tiny
SCOTH
  • MEMBER
  • 3 POSTS
The bronco does not have RWAL OR ABS.
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Wednesday, May 12th, 2010 AT 10:07 AM
Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
Ok, just wanted to be sure, I looked it up before in Mitchell and it said it had it. Did you bleed the wheels in the proper sequence? ; R/R, L/R, R/F, L/F? Did you match the master cylinder up with the old one? Was this the reason it was replaced? Are the rear brakes adjusted up properly?
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Wednesday, May 12th, 2010 AT 9:35 PM

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