Go Back   Ford Truck Enthusiasts Forums > Newer Light Duty Trucks > 1997 - 2003 F150
Sign in using an external account
Register Forgot Password?


1997 - 2003 F150 1997-2003 F150, 1997-1999 F250LD, 7700 & 2004 F150 Heritage SPONSORED BY:

Welcome to Ford-Trucks Forums!
Welcome to Ford-Trucks.com.

You are currently viewing our forums as a guest, which gives you limited access to view most discussions and access our other features. By joining our community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join the Ford-Trucks Forums community today!





 
Reply
 
 
 
 
LinkBack Thread Tools Search this Thread
  #1  
Old 04-13-2005, 03:54 PM
MC04 MC04 is offline
New User
 
Join Date: Feb 2004
Location: Florida
Posts: 8
MC04 is starting off with a positive reputation.
Master Cylinder, Brake Pressure Switch Problems

Started the truck this morning (1997 F150 4.6), went to put it in drive and I couldn't get it out of park. The brake pedal nearly touched the floor. That's when I noticed the ABS warning light blinking. Looked under the hood and noticed the master cylinder was leaking. Later on today, when there was more light, I removed the master cylinder. Found the brake pressure switch had burned up and causing the leak.

Would the faulty brake pressure switch cause the truck to be locked in park?

What would cause a brake pressure switch to short circuit and burn up? I'm lucky it didn't start a fire.

Will everything be OK once I install a new brake pressure switch and bleed the system?
Reply With Quote
  #2  
Old 04-13-2005, 07:30 PM
peppermrj's Avatar
peppermrj peppermrj is offline
Senior User
 
Join Date: Feb 2005
Location: Southwestern Pa.
Posts: 414
peppermrj is starting off with a positive reputation.
Post

Quote:
Would the faulty brake pressure switch cause the truck to be locked in park?
Yes. the power is supplied thru that circuit. It can also be caused by a blown fuse or a bad brake light switch.
Quote:
What would cause a brake pressure switch to short circuit and burn up? I'm lucky it didn't start a fire
Ah the $64.00 question. Don't know but replace it with the battery disconnected. Reconnect the battery and check it closely. Also check the fuse as it should have been toast.
Quote:
Will everything be OK once I install a new brake pressure switch and bleed the system?
You can only try and see. I would think that the hydraulic system should be fine. It might be difficult to bleed the system. The abs can require a specific scan tool to cycle the abs on and off in order to bleed it. Try a search on the bleed procedure. Sorry I can't be more specific but I have yet to fool with it on my 98.
I would also see if any codes have been stored for the ABS.

Good luck and let us know.
Reply With Quote
  #3  
Old 04-13-2005, 09:21 PM
projectSHO89 projectSHO89 is offline
Post Fiend
 
Join Date: Jan 2004
Location: St Louis
Posts: 9,048
projectSHO89 has much to be proud ofprojectSHO89 has much to be proud ofprojectSHO89 has much to be proud ofprojectSHO89 has much to be proud ofprojectSHO89 has much to be proud ofprojectSHO89 has much to be proud ofprojectSHO89 has much to be proud ofprojectSHO89 has much to be proud of
Quote:
Originally Posted by MC04

1. Would the faulty brake pressure switch cause the truck to be locked in park?

2. What would cause a brake pressure switch to short circuit and burn up? I'm lucky it didn't start a fire.

3. Will everything be OK once I install a new brake pressure switch and bleed the system?

1. Yes, indirectly. When it shorted, it probably took out F13 (underdash fuse panel). F13 supplies power to the brake light circuits including the shifter interlock.

2. See all the posts about the cruise switch recalls for the 00 and selected 01 models. there is an active investigation underway for the MY 95 -02 vehicles. Highly recommend that you go to www.nhtsa.gov and file a report with the ODI. They need additional evidence of failures of other model years to present to Ford. You're lucky the fuse blew before ignition took place.

3. Quite possibly. F13 also supplies power to the ABS computer for the KAM function.
Reply With Quote
  #4  
Old 07-11-2005, 07:59 PM
idiesel idiesel is offline
New User
 
Join Date: Jul 2005
Posts: 1
idiesel is starting off with a positive reputation.
I had the same thing happen. I have a '94 F-250TD and pulled the truck up 20 feet two days ago. Went out today to start the thing and go, and I couln't get it out of park and noticed the ABS flashing 15 times then solid, then recycle 15 times, solid, etc. I popped the hood and smelled something electrical burning and noticed the senors was melted, and the Fluid resivoir was empty. I didn't notice an excess of fluid, so not sure where it went. The sensor did NOT melt today, as the charred remains were cool.

Symptom summary:
1. Unable to shift from park. 2. ABS light flashing 15, solid, 15, solid etc. 3. There was a blown fuse on my trailer brake assy (not the dash or Maxi, under hood). 4. MC Sensor melted. 5. Brake lights don't come on.

Did replacing the sensor work on yours? I went to the wrecking yard and snagged a sensor off an Explorer with the same set-up. It didn't work, so I'm trying to figure out how to 'test' each sensor in the ABS system. Does anyone know which ones would 'report' a 'working' sensor if unplugged and which ones I need to 'short' to report themselves 'working', to test each one to stop the ABS error code? Also, I know of 5 sensors. 1 RF wheel, 1 LF wheel, 1 diff., 1 on brake pedal, one at Master Cyl.. Are there any others?
Reply With Quote
Old 07-11-2005, 07:59 PM
 
 
 
Reply

Go Back   Ford Truck Enthusiasts Forums > Newer Light Duty Trucks > 1997 - 2003 F150

Tags
2004, 97, 98, brake, cylinder, explorer, f150, ford, fuses, light, master, pressure, problems, sensor, switch, warning

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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

Forum Jump



All times are GMT -5. The time now is 03:25 AM.


Powered by vBulletin® Version 3.8.7 AC1
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Advertising - Terms of Use - Privacy Statement - Jobs
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.

vbulletin Admin Backup