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Brake lights stay on

Tiny
SAM TYER
  • MEMBER
  • 1990 CHEVROLET TRUCK

I changed the neutral safety switch but the brake lights stay on. All other lights-turn signals-running lights. The only way 2 get them to shut off is unplug the connection at/under the rear bumper
Saturday, July 17th, 2010 AT 8:26 PM

13 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
The brake light switch sounds like it needs adjustment or replacement here is a diagram to show you how. Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.
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Saturday, July 17th, 2010 AT 10:50 PM
Tiny
MATT0393
  • MEMBER
  • 2 POSTS
  • 1978 CHEVROLET TRUCK
  • V8
  • 2WD
  • AUTOMATIC
  • 61,000 MILES
I have a 78 chevy 3/4 ton 4x4 and my break light stays on check fluid and its full. And when I hit the break pedel with my head lights off my parking light come on can any one help me
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Wednesday, January 23rd, 2019 AT 6:59 PM (Merged)
Tiny
BLACKOP555
  • MECHANIC
  • 10,371 POSTS
Sounds to me like your getting feedback in the system check all of your bulbs and grounds on the vehicle.
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Wednesday, January 23rd, 2019 AT 6:59 PM (Merged)
Tiny
MATT0393
  • MEMBER
  • 2 POSTS
4 what why my parking lights come on when I hit the breaks?
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Wednesday, January 23rd, 2019 AT 6:59 PM (Merged)
Tiny
BLACKOP555
  • MECHANIC
  • 10,371 POSTS
As I explained sir. That you have feedback in the ssytem. If a bulb is burnt or the power isnt grounding out that energy has to go somewhere doesnt it? A bad bulb could cause the windshield wipers to come on when you hit the brakes.
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Wednesday, January 23rd, 2019 AT 6:59 PM (Merged)
Tiny
ROBERT355
  • MEMBER
  • 2 POSTS
  • 1993 CHEVROLET TRUCK
  • V8
  • 4WD
  • MANUAL
  • 180,000 MILES
I seem to have a tail light problem it started that the brake lights would stay on now I have just markers no turn or stop all wires are ok and the short has to be under the dash if you know any common problems to check please advise also the brake light fuse gets no power when I push the pedal down
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Wednesday, January 23rd, 2019 AT 6:59 PM (Merged)
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Hi, the voltage to the stop/haz fuse, is a live feed, hot all the time, that voltage doesn't come from the brake switch, comes from fusible link. B+ from battery supplies fusible links.
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Wednesday, January 23rd, 2019 AT 6:59 PM (Merged)
Tiny
ROBERT355
  • MEMBER
  • 2 POSTS
So are you saying to check the fusible link I don't understand what your saying that doesn't really answer my question
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Wednesday, January 23rd, 2019 AT 6:59 PM (Merged)
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
My info shows stop/hazard fuse for brake lites. If you used a testlite on the fuse circuit and no voltage, then, yes, check the fusible link. Voltage goes from fuse to brake switch, not the other way around. Maybe I misunderstood your post? I'm fixing to go watch US and Canada play hockey.
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Wednesday, January 23rd, 2019 AT 6:59 PM (Merged)
Tiny
RHOADS
  • MEMBER
  • 1 POST
  • 1984 CHEVROLET TRUCK
  • V8
  • 2WD
  • AUTOMATIC
  • 114,000 MILES
Head lights work. Brake lights work.

But the driverside brake light does not work when the head lights or parking lights are on.
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Wednesday, January 23rd, 2019 AT 6:59 PM (Merged)
Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
Hi there,

Check for a bad earth in the affected light assembly first.

Mark (mhpautos)
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Wednesday, January 23rd, 2019 AT 6:59 PM (Merged)
Tiny
RON'S SS454
  • MEMBER
  • 1 POST
  • 1990 CHEVROLET TRUCK
  • 56,000 MILES
Bake light in dash is on and pedal goes to the floor. Checked e-brake light gets brighter when depressed. Brake switch is adjusted. Figured it was master cylinder changed master cylinder and brake booster (wanted chrome one) still have the same problem. I have a good pedal when truck is off when it's running pedal goes to the floor. I am open to any sugestions that might be a fix to this problem. Thank You
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Wednesday, January 23rd, 2019 AT 6:59 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check the brake system if its leaking externally-no leak -check brake shoes adjustment if okay-recheck the master cylinder could be leaking internally
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Wednesday, January 23rd, 2019 AT 6:59 PM (Merged)

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