Go Back   Ford Truck Enthusiasts Forums > Older, Classic & Antique Trucks > 1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
Sign in using an external account
Register Forgot Password?


1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks Discuss the Early Eighties Bullnose Ford Truck

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 06-09-2006, 12:42 AM
Ford51's Avatar
Ford51 Ford51 is offline
Elder User
 
Join Date: May 2003
Location: Garland Tx
Posts: 609
Ford51 is starting off with a positive reputation.
Brake dummy light on dash.

I drive a 1982 F150 and my brake dummy light is on and won't go off, even when my emergency brake is on. I started having some brake problems recently, but didnt figure they were related since there aren't any electrical components to the brakes, so it would be difficult to turn a warning light on... I overhauled all of my brakes to fix the existing brake problem, and the light is still on. Does anyone know why this light comes on, and what might be causing it to stay on? Any help is appreciated, thanks.
__________________
1951 F6/F1
'51 F6 cab
'51 F1 chasis
'48 Mercury flathead v8
'48 F1 bed

All bought when I didn,t know what I was getting myself into. All up for sale.
Reply With Quote
  #2  
Old 06-09-2006, 01:01 AM
Piffery1 Piffery1 is offline
Posting Guru
 
Join Date: Jun 2004
Location: Niceville, FL.
Posts: 1,633
Piffery1 is gaining momentum as a positive member of FTE.
It is most likely the proportioning valve switch moved off center due to the previous brake problem. Loss of hydraulic pressure on either front or rear will cause the internal valve plunger to move to the failed side and turn on the light. I don't remember the procedure to reset.
Reply With Quote
  #3  
Old 06-09-2006, 01:48 AM
sierraben's Avatar
sierraben sierraben is offline
Post Fiend
 
Join Date: Mar 2004
Location: San Francisco, Ca.
Posts: 24,424
sierraben has a spectacular reputation.sierraben has a spectacular reputation.sierraben has a spectacular reputation.sierraben has a spectacular reputation.sierraben has a spectacular reputation.sierraben has a spectacular reputation.sierraben has a spectacular reputation.sierraben has a spectacular reputation.sierraben has a spectacular reputation.sierraben has a spectacular reputation.sierraben has a spectacular reputation.
Ford51, it could be a shorted or broken switch on the prop valve, grounded switch wires, or an un-centered prop valve.

To center the prop valve:
Turn on the ign. sw. to the ON or ACC position.
Make sure the reservoirs are filled.
Push the brake pedal down, and the piston will center itself causing the brake warning light to go off.
Turn the ignition switch to the OFF position.

Now this is in my 81 Ford Truck Shop Manual.

Hope this helps.
__________________
Reply With Quote
  #4  
Old 06-09-2006, 07:43 AM
Coneynew's Avatar
Coneynew Coneynew is offline
Senior User
 
Join Date: Nov 2002
Location: Nottingham, PA
Posts: 479
Coneynew is starting off with a positive reputation.
I had a problem w/ my Brake Light Indicator (rectangular light) beside the turn signals and high beam indicater lights. Mine also remained lit even with the parking brake off. Turns out I needed to tighten up my parking brake cable. There is a little switch on the parking brake assembly, so when it was loose the parking brake pedal would not return up far enough to make the BRAKE indicator light go out.
__________________
"Trying to keep it simple..."
Current Fords:
1985 F-350 XLT Lariet 4x2 "Camper Special" 460 auto 146k
1997 Taurus GL (SHO Clone) 4dr 3.0 Vulcan 107k
Current Non-Fords:
2009 VW Tiguan SEL 4Motion 2.0T (turbo) 48k
Reply With Quote
  #5  
Old 06-09-2006, 10:55 AM
5_labsownus's Avatar
5_labsownus 5_labsownus is offline
Posting Guru
 
Join Date: May 2002
Location: Fraziers Bottom, WV
Posts: 2,262
5_labsownus has a good reputation on FTE.5_labsownus has a good reputation on FTE.5_labsownus has a good reputation on FTE.
Ditto the answers above, Look under the dash at the e-brake and see it it has a switch on it. Some did and some did not. Most likely and common is the proportioning valve has locked of the front or rear breaks and needs reset. I have never heard of the valve going bad but it could be! Follow the info above and try to reset the valve!
__________________
Toby Wan-Knobey
WV Chapter Member


This is my RCA dog look!
Reply With Quote
  #6  
Old 06-10-2006, 12:10 AM
Ford51's Avatar
Ford51 Ford51 is offline
Elder User
 
Join Date: May 2003
Location: Garland Tx
Posts: 609
Ford51 is starting off with a positive reputation.
I'll check for the E-brake possibilty. How would I tighten it if that's the case?

I dont know that the process listed above for recentering the prop. valve would do anything because u said the light should go off when the brake is depressed. Unfortunately, the light is always on. But any other ideas are appreciated. Thanks for the help.
__________________
1951 F6/F1
'51 F6 cab
'51 F1 chasis
'48 Mercury flathead v8
'48 F1 bed

All bought when I didn,t know what I was getting myself into. All up for sale.
Reply With Quote
  #7  
Old 06-10-2006, 01:39 AM
Piffery1 Piffery1 is offline
Posting Guru
 
Join Date: Jun 2004
Location: Niceville, FL.
Posts: 1,633
Piffery1 is gaining momentum as a positive member of FTE.
Find the wire going to the proportioning valve switch and pull it off. If the light goes off then the valve/switch is not centered properly or the switch itself is bad. If the light stays on then problem is in that circuits wiring "grounded". I've been told that '80-'83's don't have an emergency (parking) brake switch, only '84 and up. My '83 doesn't have one. I think in some cases you have to "Stomp" the brake pedal really hard to make it center.
Reply With Quote
  #8  
Old 06-10-2006, 10:02 AM
5_labsownus's Avatar
5_labsownus 5_labsownus is offline
Posting Guru
 
Join Date: May 2002
Location: Fraziers Bottom, WV
Posts: 2,262
5_labsownus has a good reputation on FTE.5_labsownus has a good reputation on FTE.5_labsownus has a good reputation on FTE.
Quote:
Originally Posted by Piffery1
I've been told that '80-'83's don't have an emergency (parking) brake switch, only '84 and up. My '83 doesn't have one. I think in some cases you have to "Stomp" the brake pedal really hard to make it center.
It depends on the trim level. My 82 F-250 did not have the e-brake light but the F-150 did. It was an XLT trim pkg. Now my F-250 does because the F-150 was a parts truck.
__________________
Toby Wan-Knobey
WV Chapter Member


This is my RCA dog look!
Reply With Quote
  #9  
Old 06-10-2006, 10:37 AM
Piffery1 Piffery1 is offline
Posting Guru
 
Join Date: Jun 2004
Location: Niceville, FL.
Posts: 1,633
Piffery1 is gaining momentum as a positive member of FTE.
That's strange, the factory wiring diagram for '83 doesn't show it, but the factory wiring diagram for '84 does and as best I can tell they show all options that have electrical connections. Reckon yours was a retrofit? Next time I go "junking" I think I'll try to find one to install on my '83. Was it an easy changeover?
Reply With Quote
  #10  
Old 06-10-2006, 03:46 PM
81-F-150-Explorer 81-F-150-Explorer is offline
Post Fiend
 
Join Date: Jul 2004
Location: Northern California
Posts: 8,791
81-F-150-Explorer is a splendid one to behold81-F-150-Explorer is a splendid one to behold81-F-150-Explorer is a splendid one to behold81-F-150-Explorer is a splendid one to behold81-F-150-Explorer is a splendid one to behold81-F-150-Explorer is a splendid one to behold81-F-150-Explorer is a splendid one to behold
The 1981 owners manual states as follows:

BRAKE WARNING LIGHT

Regardless of whether your truck has standard or power boosted brakes, it is equipped with a dual master cylinder hydraulic system. If there is a loss of hydraulic pressure in either portion of the brake system, this warning light on the instrument panel glows with the word BRAKE when the brakes are applied. Illumination of the brake warning light indicates a loss of hydraulic pressur in either the front or rear brake system. When properly adjusted, the other brake system is still capable of stopping the vehicle; however, the stopping distance will be increased. Have the brake system checked imediately if the light comes on when you apply the brakes.

CAUTION: The brake warning light should glow momentarily in the START position. If it fails to glow momentarily when you start the engine, have the electrical system checked immediately.

WARNING: If the BRAKE light glows other than momentarily with the ignition lock cylinder in the start position, the braking system should be checked immediately. DO NOT OPERATE YOUR VEHICLE.

-------

There is no mention of it coming on with the Parking Brake at all. And coupled with the evidence of the owners manual and sales brochure, along with the wiring diagram, there is no option for a warning light on the parking brakes for these trucks, before 1981 at least.

All the evidence that I have states 1984 was the first year, of the Parking brake operated warning light, as standard equipment along with the clutch start cancel switch. This is also backed up by my wiring diagrams, brochures, and my friend at the Ford counter. No paperwork etc even describes such a device before 1984, that I have found.

If someone bought a 1982 or 1983, with a parking brake operated, brake warning light brand new, and has paperwork, (IE: a sales brochure, or Owners guide stating it as an option) I'd be interested in finding that out.


This question comes up more than you'd think.
Reply With Quote
  #11  
Old 06-11-2006, 12:59 AM
Ford51's Avatar
Ford51 Ford51 is offline
Elder User
 
Join Date: May 2003
Location: Garland Tx
Posts: 609
Ford51 is starting off with a positive reputation.
Alright so I guess I'll forget the E-brake possibilties. I tried the method mentioned by turning the battery on, pushing the brake, turning it off, etc. but the light did not go off when I pushed the brake.

Like I said in a previous post, the light is always on. Not just when the brakes are applied or not applied. And as far as I know I havent lost any hydraulic power. I just bled the brakes today since I recently repaired them and right after, had to slam on the brakes to avoid a wreck. As far as I know all 4 brakes locked up because the front end swerved gradually, which leads me to believe the front brakes locked up (but that may be wrong) And I know the rear brakes work since I tested them when I put the drum back on, and they had pressure when I bled them. Also, my brake fluid stays even in the two resevoirs... So I'm not so certain it indicates a loss of pressure. But again that may be wrong.

Where is this valve located? I guess I'll test for an electrical problem first since I dont have any other method to re-center it than the one that I tried. I'll try "stomping" on it this time like listed above. Keep the ideas coming, thanks for the help.
__________________
1951 F6/F1
'51 F6 cab
'51 F1 chasis
'48 Mercury flathead v8
'48 F1 bed

All bought when I didn,t know what I was getting myself into. All up for sale.
Reply With Quote
  #12  
Old 06-11-2006, 01:05 AM
Ford51's Avatar
Ford51 Ford51 is offline
Elder User
 
Join Date: May 2003
Location: Garland Tx
Posts: 609
Ford51 is starting off with a positive reputation.
Alright stomping on it with the previously used method didn't work either, so the electrical possibilities mentioned could be right. I'll keep trying.
__________________
1951 F6/F1
'51 F6 cab
'51 F1 chasis
'48 Mercury flathead v8
'48 F1 bed

All bought when I didn,t know what I was getting myself into. All up for sale.
Reply With Quote
  #13  
Old 06-11-2006, 01:19 AM
must-be-a-stang must-be-a-stang is offline
Senior User
 
Join Date: May 2006
Posts: 116
must-be-a-stang is starting off with a positive reputation.
I look forward to seeing what you find out because I have the excate same problem. It stays on no matter what but everything seems to work fine. Do you have a brake booster installed...the thing that controles brakes on a trailer?

The owner before me just put some black elctrical tape over the light... so I left it.
Reply With Quote
  #14  
Old 06-11-2006, 01:23 AM
Ford51's Avatar
Ford51 Ford51 is offline
Elder User
 
Join Date: May 2003
Location: Garland Tx
Posts: 609
Ford51 is starting off with a positive reputation.
I have the factory brake booster but nothing to control trailer brakes.
__________________
1951 F6/F1
'51 F6 cab
'51 F1 chasis
'48 Mercury flathead v8
'48 F1 bed

All bought when I didn,t know what I was getting myself into. All up for sale.
Reply With Quote
  #15  
Old 06-11-2006, 10:17 AM
Piffery1 Piffery1 is offline
Posting Guru
 
Join Date: Jun 2004
Location: Niceville, FL.
Posts: 1,633
Piffery1 is gaining momentum as a positive member of FTE.
Just follow the brake lines from the master cylinder; the differential/proportioning valve is the first thing you come to. Unplug the electrical connector, if the warning light goes "off" its most likely a bad warning switch but it's possible that there is a short in the wire between the warning switch and the ignition switch terminal. If the light remains "on" then there is a short in the wire between the switch and the instrument panel.
Reply With Quote
Old 06-11-2006, 10:17 AM
Reply

Go Back   Ford Truck Enthusiasts Forums > Older, Classic & Antique Trucks > 1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks

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 05:18 PM.


Powered by vBulletin® Version 3.7.5
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