dash light on
Thread Starter
|
Freshman User
Joined: Jan 2006
Posts: 34
Likes: 0
From: Manteca, CA
dash light on
Hi All, just got a 84 f-250 with a 5.8. With a holly 4bl. Their is a light on the top of the dash just to the left of the right turn signal indicator. Their is no cover so I can see the bulb. What is it for and how can I reset it. Plus I was trying to find out where the vac hose goes from the air temp sensser on the air cleaner.I can't find the air cleaner stuff on the vac diagram. Thanks Dave
Post Fiend
Joined: Jul 2004
Posts: 8,786
Likes: 28
From: Northern California
That would be your Brake Warning Light.
It should only come on under three circumstances on you 1984.
1) Parking Brake engaged.
Check the switch on the Parking brake pedal. Unplug the switch and the light should go out. If it don't, continue on...
2) As a momentary test when you first start the truck.
The ignition switch and lock cylinder actuating rod could be out of adjustment. With the engine running try turning the lock cylinder back towards the off position slightly. Not enough to kill the engine, but enough to kill the light etc...
3) You have a major problem with the brake system, and shouldn't be driving the vehicle.
Check the porportioning valve, in the engine compartment. Located on top of the framerail on the left side. It is a metal valve that has one wire plugged into it, and four metal brake lines attached. Remove the wire and the light should go off. This could be a minor problem like, you need a new porportioning valve, or your brakes need to be blead, to a very serious problem of, only half of your brakes are functioning, either front or rear.
Hope this helps.
Let us know what you find out.
It should only come on under three circumstances on you 1984.
1) Parking Brake engaged.
Check the switch on the Parking brake pedal. Unplug the switch and the light should go out. If it don't, continue on...
2) As a momentary test when you first start the truck.
The ignition switch and lock cylinder actuating rod could be out of adjustment. With the engine running try turning the lock cylinder back towards the off position slightly. Not enough to kill the engine, but enough to kill the light etc...
3) You have a major problem with the brake system, and shouldn't be driving the vehicle.
Check the porportioning valve, in the engine compartment. Located on top of the framerail on the left side. It is a metal valve that has one wire plugged into it, and four metal brake lines attached. Remove the wire and the light should go off. This could be a minor problem like, you need a new porportioning valve, or your brakes need to be blead, to a very serious problem of, only half of your brakes are functioning, either front or rear.
Hope this helps.
Let us know what you find out.
Senior User
Joined: May 2006
Posts: 116
Likes: 0
What about an 81 f150? This is a problem my truck had when I bought it and the other owner's husband just put black tape over the light housing on the dash. My truck had a break booster or whatever added for trailors, could this be it?
Lead Driver
Joined: Dec 2002
Posts: 5,491
Likes: 16
From: Kuna ID
The same thing should apply to an 81 F-150, check all the above mentioned items on your truck as well. A trailer brake shouldn't affect the dash light, unless it's an older type that plumbs into the brake line, then I suppose it's possible.
Post Fiend
Joined: Jul 2004
Posts: 8,786
Likes: 28
From: Northern California
Originally Posted by Piffery1
I think the parking brake switch is only on '84 & up. Neither my '83 F350 or an '82 F150 that I got parts off of had one nor does it show up in my wiring diagrams. Maybe an option?
Thread Starter
|
Freshman User
Joined: Jan 2006
Posts: 34
Likes: 0
From: Manteca, CA
Thanks's 81 EXP it was the porportioning valve senser. I know the brakes are bad the front res of the master is dry. Just wanted to make sure the light was not emission relatet. Thanks What about the VAC hose? Any one knoe
Trending Topics
Posting Guru
Joined: Jun 2004
Posts: 1,635
Likes: 0
From: Niceville, FL.
Your vacuum hose diagram on radiator support should show it. A/CL=Air Cleaner. In general there are two main components: A/CL BI Met (air temp bi-metallic valve) and an A/Cl Diverter Valve (solenoid operated flapper valve). Some vehicles may have other items such as a Cold Weather Modulator (CWM). If your diagram is missing try clicking this link and looking for your vehicles' diag.: http://www.autozone.com/servlet/UiBroker?ForwardPage=/az/cds/en_us/0900823d/80/0c/e6/05/0900823d800ce605.jsp In most cases it runs off straight manifold vacuum.
Last edited by Piffery1; May 27, 2006 at 05:03 PM. Reason: add
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Top 10 Fords at 2026 Carlisle Ford Nationals
Joe Kucinski
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
