Brake fade/soft pedal--rabs bypass repair 92 F-250 - Ford Truck Enthusiasts Forums



Pre-Power Stroke Diesel (7.3L IDI & 6.9L) Diesel Topics Only

Brake fade/soft pedal--rabs bypass repair 92 F-250

Reply
 
 
 
Thread Tools Search this Thread
  #1  
Old 10-12-2008, 10:43 AM
chipper's Avatar
chipper chipper is offline
Senior User
Thread Starter
 
Join Date: Aug 2003
Location: west central wisconsin
Posts: 310
chipper is starting off with a positive reputation.
Brake fade/soft pedal--rabs bypass repair 92 F-250

After 2 hours of reading posts and waiting for all the ads to download from this website. I thought I might try to simplify this for the next guy.

My 92 F-250 had a soft brake pedal and would fade very quickly, pedal would quickly go to the floor. Of course the first thing I thought of is the master cylinder. Well three different MC made no difference. Also adjusted the rear brakes and bled the brake so many times I can't count. No change.

So here's the FIRST thing everyone needs to do. Yes, try this BEFORE you change out the MC. Under the drivers side floor board, inside the frame rail is the rear abs contoller/module. Facing the front is a large hex nut. Carefully remove this nut. I used a 1 1/4 inch box end wrench. This may not be the exact size but it is what worked for me. Simply remove the nut and TAKE OUT THE SPRING, caution the nut is under pressure from the sping. No brake fluid will leak out. Then replace the nut. Pump your brakes a few times to compress the controller. That's it. This bypasses the rabs contoller which has failed and is letting brake fluid leak by the seals which causes the brake pedal to fade. No the abs light will not light up on the dash.

Disclaimer:CAUTION This will disable the rear abs. Is the truck safe to drive now that you have good brakes but have disabled the rear abs? This is up to each owner to decide. The controller could be replaced, part cost $150-$250 so I was told.

I personally couldn't be happier to have my truck back on the road with good brakes FINALLY. Never really noticed the abs anyway, and certainly don't notice any difference without the abs. Except I have BRAKES.

Also this repair was posted by another forum member. Which I would really like to thank. So THANK YOU for posting this info. I'm just trying to make it easier to find. Maybe the next guy will not have to waste all the time and money like I did to find this simple repair.
Reply With Quote
  #2  
Old 10-12-2008, 01:49 PM
David85's Avatar
David85 David85 is offline
Post Fiend
 
Join Date: Nov 2003
Location: Campbell River, B.C.
Posts: 6,900
David85 has a good reputation on FTE.David85 has a good reputation on FTE.
Glad my truck never had ABS. My Dad's GMC will randomly lock up one of the wheels, sometimes the front, sometimes the rear. Nearly sent him into the ditch one time when the front locked up, and nearly hit a deer the other time because it cut the breaking effect so much (WTF!!!). Works fine in a none emergency situation though....stupid ABS. Thanks for posting, I'm sure some one else will find this info useful. Break fade is something I heard more than a few times happening on RABS equipped ford trucks of the late 80s and early 90s.
Reply With Quote
  #3  
Old 02-02-2013, 07:50 PM
TradMercs TradMercs is offline
New User
 
Join Date: Aug 2010
Posts: 17
TradMercs is starting off with a positive reputation.
Chipper, you solved a plaguing problem I've had with my 92 diesel since day one, 3 years ago. Thank you so ever much! I hope more people see this post. Thanks again man! Finally have a real pedal and excellent stopping power, not mushy low garbage.
Reply With Quote
  #4  
Old 02-04-2013, 01:45 PM
1989f250IDI's Avatar
1989f250IDI 1989f250IDI is offline
Elder User
 
Join Date: Jul 2012
Location: Adair, ok
Posts: 501
1989f250IDI is starting off with a positive reputation.
Im interested in trying this now..
Reply With Quote
  #5  
Old 02-04-2013, 02:31 PM
vfelix702's Avatar
vfelix702 vfelix702 is offline
Posting Guru
 
Join Date: Dec 2010
Location: Las vegas nevada
Posts: 1,029
vfelix702 is gaining momentum as a positive member of FTE.
Im signing up too lol cant wait to feel the results! !!
Reply With Quote
  #6  
Old 02-05-2013, 07:36 AM
goose_ss4 goose_ss4 is offline
Senior User
 
Join Date: Jan 2011
Posts: 260
goose_ss4 is starting off with a positive reputation.
i will trying this as well. cant say i have a pedal problem, but my rabs light and ebrake light on the dash come peridoicly
Reply With Quote
  #7  
Old 02-06-2013, 01:35 AM
Greg5OH Greg5OH is offline
Posting Guru
 
Join Date: Mar 2012
Location: MI
Posts: 1,011
Greg5OH is starting off with a positive reputation.
i did this but no change. it did turn out to be the rear whyeel cylinders. Pedal was great for about a month but its starting to get a little soft again...
Reply With Quote
  #8  
Old 06-08-2013, 06:41 PM
vfelix702's Avatar
vfelix702 vfelix702 is offline
Posting Guru
 
Join Date: Dec 2010
Location: Las vegas nevada
Posts: 1,029
vfelix702 is gaining momentum as a positive member of FTE.
Still need to do this... just settled into a house with a garage so now its time to start doing thr stuff I want to do lol
Reply With Quote
  #9  
Old 07-27-2013, 04:39 PM
hairyboxnoogle's Avatar
hairyboxnoogle hairyboxnoogle is online now
Post Fiend
 
Join Date: Apr 2008
Location: Jordan Valley, OR
Posts: 6,372
hairyboxnoogle has a good reputation on FTE.hairyboxnoogle has a good reputation on FTE.
Just found this... doing it tonight to see if it gets rid of my issues.
Reply With Quote
  #10  
Old 07-27-2013, 06:13 PM
tjc transport's Avatar
tjc transport tjc transport is offline
i ain't rite
 
Join Date: Mar 2005
Location: Marlboro Mental Hospital
Posts: 46,329
tjc transport has a superb reputationtjc transport has a superb reputationtjc transport has a superb reputationtjc transport has a superb reputationtjc transport has a superb reputationtjc transport has a superb reputationtjc transport has a superb reputationtjc transport has a superb reputationtjc transport has a superb reputationtjc transport has a superb reputationtjc transport has a superb reputation
i went one step farther and completely bypassed the ABS unit back in 1988 3 months or so after i bought the truck because i got tired of brakes that worked when they wanted to.
since i never had a vehicle with ABS, not having it on this truck was not a problem.
most of the vehicles i drive do not have abs, including my tractor trailers and dump trucks.
Reply With Quote
  #11  
Old 07-27-2013, 11:00 PM
hairyboxnoogle's Avatar
hairyboxnoogle hairyboxnoogle is online now
Post Fiend
 
Join Date: Apr 2008
Location: Jordan Valley, OR
Posts: 6,372
hairyboxnoogle has a good reputation on FTE.hairyboxnoogle has a good reputation on FTE.
Ya im with ya, i know how to drive and am not a big fan of ABS. Can the ABS "stick" so that the brakes drag? I have all the other described symptoms IE: feels like only the fronts working, randomly locking rear tires, pedal fade when i really push on it... and when i really push on it, thats when the brakes hang up. EVERYTHING is new minus the abs valve.
Reply With Quote
  #12  
Old 07-28-2013, 08:58 AM
tjc transport's Avatar
tjc transport tjc transport is offline
i ain't rite
 
Join Date: Mar 2005
Location: Marlboro Mental Hospital
Posts: 46,329
tjc transport has a superb reputationtjc transport has a superb reputationtjc transport has a superb reputationtjc transport has a superb reputationtjc transport has a superb reputationtjc transport has a superb reputationtjc transport has a superb reputationtjc transport has a superb reputationtjc transport has a superb reputationtjc transport has a superb reputationtjc transport has a superb reputation
i really can't say.
the only thing that has working abs is the crown vic. and the only reason that is not bypassed is i like the traction control feature in the winter.
it will sense wheel spin and apply a little brake so the limited slip diff will send more power to the other wheel, enabling the car to go just about anywhere in snow or slick conditions.
Reply With Quote
  #13  
Old 10-01-2016, 04:07 PM
joelm73 joelm73 is offline
New User
 
Join Date: Oct 2016
Posts: 1
joelm73 is starting off with a positive reputation.
Tried your fix. Worked like a charm. Out of curiosity, I wonder if this is only making the rear brakes work better since it is disabling the rear anti-lock brakes module. Either way, it stops much better than before. It would be nice to know the front brakes are still doing most of the work though.
Reply With Quote
  #14  
Old 10-01-2016, 04:45 PM
tjc transport's Avatar
tjc transport tjc transport is offline
i ain't rite
 
Join Date: Mar 2005
Location: Marlboro Mental Hospital
Posts: 46,329
tjc transport has a superb reputationtjc transport has a superb reputationtjc transport has a superb reputationtjc transport has a superb reputationtjc transport has a superb reputationtjc transport has a superb reputationtjc transport has a superb reputationtjc transport has a superb reputationtjc transport has a superb reputationtjc transport has a superb reputationtjc transport has a superb reputation
Quote:
Originally Posted by joelm73 View Post
Tried your fix. Worked like a charm. Out of curiosity, I wonder if this is only making the rear brakes work better since it is disabling the rear anti-lock brakes module. Either way, it stops much better than before. It would be nice to know the front brakes are still doing most of the work though.
welcome to FTE.
yes you are correct that this only effects the rear brakes.
there is no connection between the rear abs and the front brake circuit except that they both are connected to the master cylinder.
Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
sinking brake pedal still !!!! Greg5OH Pre-Power Stroke Diesel (7.3L IDI & 6.9L) 31 05-31-2017 04:55 AM
Brakes __JT__ Brakes, Steering, Suspension, Tires, & Wheels 5 03-04-2017 11:16 AM
2002 F150 brake pedal fade Grandpa's1983 1997 - 2003 F150 31 05-29-2016 10:43 AM
Soft brake and brake pedal problem.. timbersteel 1987 - 1996 F150 & Larger F-Series Trucks 5 04-26-2016 12:11 AM
93 F-SUPERDUTY SOFT BRAKES Hardlanding 1987 - 1996 F150 & Larger F-Series Trucks 3 04-07-2016 09:52 AM


Go Back   Ford Truck Enthusiasts Forums >

Tags
89, 92, abs, brake, bypass, diesel, early, f150, f250, f25o, fade, ford, pedal, rabs, soft

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump


All times are GMT -5. The time now is 05:25 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.