97' F250 - weird brake light problem - Ford Powerstroke Diesel Forum
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Old 06-15-2013, 03:43 AM
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97' F250 - weird brake light problem

I have a 97' F250 Power Stroke with a strange problem.

The brake lights won't go off.

I had a new steering column put in at the local auto repair shop. Everything was fine when I picked it up, then when I got it home I noticed that the brake lights remained on after I parked the truck.

Key on, key off, push brake, let off brake, emergency brake on, emergency brake off - nothing seems to matter. I finally disconnected both batteries which of course turned off the lights but reconnecting the batteries turned them back on.

The steering column they used was from a vehicle with an airbag & my original did not have an airbag but they made it work. Could this be an issue?

The repair shop is closed until Monday AM.

Where do I look?

Last edited by W8EJO; 06-15-2013 at 06:30 AM.
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Old 06-19-2013, 04:01 AM
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This gets stranger and stranger.

If I start the truck, the brake lights go off when they should and on when they should.

When I shut it off and the truck sits for 8-10 hours (e.g., overnight) the brake lights will come back on by themselves as if a little elf is in there pushing on the brake. I re-start the truck & they go off. The cycle repeats the next morning when I wake up & look out the window to see the brake lights have mysteriously come back on overnight - again.

What could be causing this?
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Old 06-19-2013, 04:42 AM
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Brake light switcha are sometimes adjustable not sure if they are on these trucks never looked at mine but the reason there going back on sometime later is because the brake booster is slowly losing vacuum as the truck sits completey normal with the truck off keep pressing the pedal notice How it gets harder same thing it just takes longer if u don't push it ... so its moving out every so slightly and bam lights are back on I'd be taking it back to that shop have them Figure it out
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Old 06-19-2013, 04:47 AM
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The switch is mounted at the top of the lever that the pedal is attached to so they could of bumped it when they were changing the column
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Old 06-19-2013, 05:12 AM
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Quote:
Originally Posted by jake-96-7.3 View Post
Brake light switcha are sometimes adjustable not sure if they are on these trucks never looked at mine but the reason there going back on sometime later is because the brake booster is slowly losing vacuum as the truck sits completey normal with the truck off
Thanks Jake.

So if i understand you correctly, it's normal for the brake booster to slowly lose vacuum as the truck sits. As this happens, the brake pedal slowly moves down, maybe by fractions of an inch, as if someone is pushing it slightly.

And if the brake light switch isn't installed or adjusted properly the brake lights will come on due to this slow, normal loss of vacuum in the brake booster.

Do I understand this?
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Old 06-19-2013, 02:22 PM
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you are correct so if they bumped it or bent it somehow when installing the column that could cause your issue
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