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The brake pedal goes to the floor. About a year and a half ago it had all new front pads rear shoes

Tiny
GRIFFINP19
  • MEMBER
  • 1993 FORD F-150
  • 5.0L
  • V8
  • 2WD
  • AUTOMATIC
  • 102,000 MILES
The brake pedal goes to the floor. About a year and a half ago it had all new front pads rear shoes all new wheel cylinders and a master cylinder and hydraulic fluid. Everything worked perfectly until the pedal suddenly went to the floor. The brake will stop the truck, but not very well.
I inspected all of the wheel cylinders and brake lines for leaks. This is not a rusty truck (no rust). I purchased a brand new master cylinder and nothing changed after complete brake bleeding in the proper order.
Could the issue be the RABS Valve?
1993 F15 rear drive auto 5.0.
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Tuesday, June 22nd, 2021 AT 12:05 PM

10 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,709 POSTS
Hi,

Does it have ABS? If it does, then chances are there is air in the ABS control unit. See pic 1 for directions.

If it doesn't have ABS, check the booster push rod for adjustment. I attached the directions below (pics 2 and 3).

Let me know what you find or if you have other questions. Note: If the master cylinder is new, bench bled, the brake system was bled, there are no leaks, proper adjustment of the pushrod has been made, and this doesn't have ABS, the new master cylinder may be bad.

Take a look through this link:

https://www.2carpros.com/articles/brake-pedal-goes-to-the-floor

Let me know what you find.

Take care,

Joe

See pics below.

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Tuesday, June 22nd, 2021 AT 10:02 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,709 POSTS
Hi,

Does it have ABS? If it does, then chances are there is air in the ABS control unit. See pic 1 for directions.

If it doesn't have ABS, check the booster push rod for adjustment.

Let me know what you find or if you have other questions. Note: If the master cylinder is new, bench bled, the brake system was bled, there are no leaks, and this doesn't have ABS.
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Tuesday, June 22nd, 2021 AT 10:02 PM
Tiny
GRIFFINP19
  • MEMBER
  • 6 POSTS
It has rear ABS only.
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Wednesday, June 23rd, 2021 AT 9:15 AM
Tiny
GRIFFINP19
  • MEMBER
  • 6 POSTS
This is a symptom that went from everything is okay and normal with a good pedal to dropping to the floor with very little braking.
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Wednesday, June 23rd, 2021 AT 9:16 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,709 POSTS
Hi,

I just read through things again, and rear ABS applies. Also, the RABS valve is involved for b bleeding.

I attached the directions below. I highlighted important areas of concern.

It requires special "Ford" tooling to complete. I looked up the part numbers indicated, and I feel you may want to find someone that has them. They are expensive.

Take a look through the attachment and let me know if it helps. Also, let me know if you have other questions.

Take care,

Joe

See pic below.
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Wednesday, June 23rd, 2021 AT 8:31 PM
Tiny
GRIFFINP19
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  • 6 POSTS
Joe, thank you.
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Thursday, June 24th, 2021 AT 5:44 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,709 POSTS
You are very welcome. If you have a chance, let me know if that takes care of the problem. I hope it helps.

Take care,

Joe
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+1
Thursday, June 24th, 2021 AT 8:02 PM
Tiny
GRIFFINP19
  • MEMBER
  • 6 POSTS
I have an appointment with the local dealer.
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Friday, June 25th, 2021 AT 11:04 AM
Tiny
GRIFFINP19
  • MEMBER
  • 6 POSTS
I gave it one more try. I found the right rear drum brake adjusted spring had failed and the adjuster became dislodged. I replaced a couple of parts and the brakes now work normally again.
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Friday, June 25th, 2021 AT 6:45 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,709 POSTS
That makes perfect sense. Chances are one of the brake shoes wasn't seated on the wheel cylinder, correct?

Regardless, I'm glad you found the problem. Take care of yourself and feel free to come back anytime in the future.

Joe
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Friday, June 25th, 2021 AT 7:48 PM

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