Odd brake problem - Ford Truck Enthusiasts Forums



1994.5 - 1997 7.3L Power Stroke Diesel SPONSORED BY:

Odd brake problem

Reply
 
 
 
LinkBack Thread Tools Search this Thread
  #1  
Old 08-11-2014, 08:02 AM
TriednTrueFordBlue TriednTrueFordBlue is offline
Freshman User
Thread Starter
 
Join Date: Jul 2014
Posts: 35
TriednTrueFordBlue is starting off with a positive reputation.
Odd brake problem

I have a 95 F Superduty 7.3 with an intermittent soft brake pedal. Just started noticing it last week, randomly when i stepped on the brake pedal it would feel alot softer than usual but i let up and the pedal would feel normal. However, today when driving around my yard it started doing it more frequently. Ive know there is a slight leak around the hydro boost area since I bought the rig, causing me to have to top off the master and power steering reservoirs every couple of months. Its not enough for there to ever be a puddle below it and no drips and never any lose of brakes or power steering, I would top them off when the whining noise would start when stepping on the pedal or turning the wheel.

My guess is the hydroboost as no lines or calipers are wet at all. Just looking for a second opinion before i spend the money. Other guess would be the ABS valve?
Reply With Quote
  #2  
Old 08-11-2014, 08:29 AM
mjunk1's Avatar
mjunk1 mjunk1 is offline
Posting Guru
 
Join Date: May 2005
Location: Sherrills Ford, NC
Posts: 1,718
mjunk1 is gaining momentum as a positive member of FTE.mjunk1 is gaining momentum as a positive member of FTE.
Sounds like you are on the right track. Have you changed the fluid recently? The only other thing I would think is that it might be worth changing the PS fluid fully to see if that helps. The added viscosity of new fluid might give you some additional life.
Reply With Quote
  #3  
Old 08-11-2014, 09:12 AM
TriednTrueFordBlue TriednTrueFordBlue is offline
Freshman User
Thread Starter
 
Join Date: Jul 2014
Posts: 35
TriednTrueFordBlue is starting off with a positive reputation.
So apon further research I have realized what I thought was the hydroboost was actually the accumulator and that is the general area where I have fluid seepage. Degreased and power washed the area and had a buddy pump the brake while I looked for leaks and found nothing. I am going to take your advice on changing the fluid once I solve the leak
Reply With Quote
  #4  
Old 08-11-2014, 09:21 AM
jchosler's Avatar
jchosler jchosler is offline
Elder User
 
Join Date: Nov 2009
Location: Denver, CO
Posts: 803
jchosler is starting off with a positive reputation.
I dont have an F superduty so I know/think your setup is a little different then us 3/4 and 1 ton guys but I had a similar issue recently. I opened up both rear drms, one side was fine but needed new hardware and the other side was shot. A few springs were snapped and the pad assembly was able to sway back and forth. Fixed all that and good as new!
Reply With Quote
  #5  
Old 08-11-2014, 09:24 AM
TriednTrueFordBlue TriednTrueFordBlue is offline
Freshman User
Thread Starter
 
Join Date: Jul 2014
Posts: 35
TriednTrueFordBlue is starting off with a positive reputation.
Yeah mine has disc's out back and there is no seepage at the calipers
Reply With Quote
  #6  
Old 08-21-2014, 01:00 PM
TriednTrueFordBlue TriednTrueFordBlue is offline
Freshman User
Thread Starter
 
Join Date: Jul 2014
Posts: 35
TriednTrueFordBlue is starting off with a positive reputation.
so since this post I have flushed both the brake fluid and power steering, rebuilt the hydroboost with new seals and O rings, removed the ABS 20amp fuse, cleaned the rear load sensing brake proportioning valve and disconnected from the axle and obviously bleed brakes. Still have the same issue. Can pump the brakes with the ignition off then turn the key and pedal goes to the floor, not every time though. Im stumped. Being an F-superduty it doesnt have the rabs proportioning unit on the frame rail below the MC so i cant bypass it. Any thoughts or suggestions?
Reply With Quote
  #7  
Old 08-22-2014, 10:12 AM
IDMooseMan's Avatar
IDMooseMan IDMooseMan is offline
Postmaster
 
Join Date: Jul 2006
Location: Nampa, ID
Posts: 2,722
IDMooseMan has a great reputation on FTE.IDMooseMan has a great reputation on FTE.IDMooseMan has a great reputation on FTE.IDMooseMan has a great reputation on FTE.IDMooseMan has a great reputation on FTE.
Well, I'm having similar issues on my truck (see signature). Shops are telling me it could be either the RABS (which you don't have) or the MC going bad.
Reply With Quote
  #8  
Old 08-23-2014, 08:58 AM
TriednTrueFordBlue TriednTrueFordBlue is offline
Freshman User
Thread Starter
 
Join Date: Jul 2014
Posts: 35
TriednTrueFordBlue is starting off with a positive reputation.
After all my reading, I think that it has RABS but it is different than the 250 and 350 in that it is inside the MC, seems to be the best thing to try next, although I'm trying not to just throw money at it.
Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
79 bronco brake problems mv7fd 1978 - 1996 Big Bronco 11 10-29-2016 10:18 PM
7.3 hydroboost failing? 20powerstroke02 1999 - 2003 7.3L Power Stroke Diesel 2 05-30-2016 10:08 AM
High Idle / Brake question / Power Steering cpye2 1999 - 2003 7.3L Power Stroke Diesel 17 03-10-2016 10:40 AM
Brake pedal sticking CountryBumkin 1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks 5 09-22-2013 03:08 PM
Floppy brake pedal post swap oldblu 1961 - 1966 F-100 & Larger F-Series Trucks 9 12-31-2011 02:28 PM


Go Back   Ford Truck Enthusiasts Forums >

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 On
Pingbacks are On
Refbacks are On

Forum Jump


All times are GMT -5. The time now is 12:27 PM.


This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. FordŽ is a registered trademark of the Ford Motor Company.