Brake issues: at my wits end!!!!!! - Diesel Forum - TheDieselStop.com
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post #1 of 9 (permalink) Old 10-04-2014, 12:07 PM Thread Starter
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Brake issues: at my wits end!!!!!!

I have been trying to figure out why my brake pedal goes almost all the way down to the floor. I have replaced the pads, drums, shoes, calipers, vacuum pump, wheel cylinders, Master cylinder X's 2, Brake booster. Bleed the brakes many times Any suggestions????? Thanks in advance.

1996 F-350 psd crew drw, demuffed, fumotoed, home-made intake, edge evo, post triple pillar auto meter gauges,line-x (10-16-05).Seat mod (11-13-05).on-board air(viair 450c) with horns (Kleinn triple train) (8-21-06).Bilsteins (11-28-06)Upgraded headlight harness.IDM MOD by Matty, SOCAPS member <img src="/ubbthreads/images/graemlins/smile.gif" alt="" />thanks Matt!! Stancor gpr (12/26/07) Coolant filter (11-1-2008) Relocated Block heater plug (1/01/2011) Tranni by JOHN WOOD (12-08-2009) Thanks JOHN more mods to come.
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post #2 of 9 (permalink) Old 10-04-2014, 03:08 PM
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Pedal drop has only a few causes on your vehicle: hydraulic leak, master cylinder bypass, or internal bypass of the RABS valve.

People who have had the similar problem and list of repairs on your era truck usually find in the end it was the RABS valve, something you had not listed in the repair attempts.

Without knowing more of what you have done I would change out the valve. The problem here is finding a replacement! Some have just bypassed the valve with tubing to rid themselves of the problem. That works OK if the vehicle also has a rear brake PROPORTIONING valve. If it does not, then adding in an aftermarket unit then dialing in the proper setting to prevent excessive and dangerous rear wheel skids is the best action.

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post #3 of 9 (permalink) Old 10-04-2014, 03:39 PM
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Did you bleed the RABS valve? Did you adjust the rear shoes? Did you bench bleed the master cylinder before installing it?
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post #4 of 9 (permalink) Old 10-04-2014, 05:02 PM Thread Starter
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I did not bleed the RABS. I did bench bleed the master cylinder. Thank you for the replies!!!!!!

1996 F-350 psd crew drw, demuffed, fumotoed, home-made intake, edge evo, post triple pillar auto meter gauges,line-x (10-16-05).Seat mod (11-13-05).on-board air(viair 450c) with horns (Kleinn triple train) (8-21-06).Bilsteins (11-28-06)Upgraded headlight harness.IDM MOD by Matty, SOCAPS member <img src="/ubbthreads/images/graemlins/smile.gif" alt="" />thanks Matt!! Stancor gpr (12/26/07) Coolant filter (11-1-2008) Relocated Block heater plug (1/01/2011) Tranni by JOHN WOOD (12-08-2009) Thanks JOHN more mods to come.
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post #5 of 9 (permalink) Old 10-04-2014, 10:05 PM Thread Starter
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Replaced and bled the RABS. The connector didn't match so I cut the one off the old RABS and matched up the wires. There is a spot/ connection on the rear axle and closest to the drivers side that pairs up the right and left to a square with a hole in it. It looks like its suppose to be connected. I don't know the official name of it.

1996 F-350 psd crew drw, demuffed, fumotoed, home-made intake, edge evo, post triple pillar auto meter gauges,line-x (10-16-05).Seat mod (11-13-05).on-board air(viair 450c) with horns (Kleinn triple train) (8-21-06).Bilsteins (11-28-06)Upgraded headlight harness.IDM MOD by Matty, SOCAPS member <img src="/ubbthreads/images/graemlins/smile.gif" alt="" />thanks Matt!! Stancor gpr (12/26/07) Coolant filter (11-1-2008) Relocated Block heater plug (1/01/2011) Tranni by JOHN WOOD (12-08-2009) Thanks JOHN more mods to come.
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post #6 of 9 (permalink) Old 11-01-2018, 10:36 AM
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Having very similar issues. I just bypassed the ABS valve after replacing all that you mentioned and brake pedal still slowly goes to the floor. Was wondering what your final solution was?
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post #7 of 9 (permalink) Old 11-01-2018, 11:30 AM
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Fordmedic hasn't been on the site in over 2 years, so may not be likely to reply.

I'll move your post to Wheels, Tires, Brakes and Suspension.

Jack (FMTRVT) may be more likely to see it there. He's the resident brake guru.

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post #8 of 9 (permalink) Old 11-01-2018, 07:26 PM
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post #9 of 9 (permalink) Old 11-02-2018, 10:38 AM
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Quote:
Originally Posted by gibrokich View Post
Having very similar issues. I just bypassed the ABS valve after replacing all that you mentioned and brake pedal still slowly goes to the floor. Was wondering what your final solution was?
I'm not sure what you mean by "bypassed ABS valve",

But I had a similar issue and here is my post on another forum with a link for a way to test ABS HCU.

I've had the same problem for a few years on my wifey's F150.
Had a dealer change master , all fluid, pads everything - no help.
Then after a while it started getting worse.

After some research I came across this thread and post #20 outlines how to check an ABS hydraulic control unit.
https://www.ford-trucks.com/forums/9...edal-fade.html

I changed the ABS hcu and all is back to normal

I dont think it's quite the same on our super duties, but it's a good place to start looking after the obvious has been checked, ( ie, leaks, air in lines, etc.)

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