Big GMC truck
Registered Member
A couple of days ago, I used my parking brake. When I released it, the light stayed on. It has been on ever since. What could cause this?
CK5
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E Brake Light Stays on
- Thread starter Big GMC truck
- Start date
try just slightly lifting up on the ebrake lever that you press down.. mine got stuck down like that so the light stayed on so i had to ziptie mine up to the dash.. haha stupid thing.
pauly383
Daddy383
I found out after I had unknowingly bent the cable bracket underneath the truck ( frame slide 
) , that the cable would not return all the way .
Won't hurt to check the cable for binding at all .
Try pulling up on the pedal , if the light goes out , that could be it , in the cable .
) , that the cable would not return all the way . Won't hurt to check the cable for binding at all .
Try pulling up on the pedal , if the light goes out , that could be it , in the cable .
Esteban86K5
1/2 ton status
Check your fluids.
Leper
1/2 ton status
what kind of truck?
Big GMC truck
Registered Member
The truck is a 1984 GMC K1500 305 4 speed
I don't think the truck has any fluid level sensors to trigger the light.
I don't think the truck has any fluid level sensors to trigger the light.
Sure it does, it's on the proportioning valve.
Low fluid on one side will trigger it, as will a leak in the front or rear of the system.
Low fluid on one side will trigger it, as will a leak in the front or rear of the system.
Big GMC truck
Registered Member
About 3 months ago, fluid was leaking out of one of the rear wheel cylinders. The leak has been gone since. I had no idea that the truck(no computer) has the ability to sense a leak. I always thought that the red brake dash light sensed P brake engagement only. I'm pretty sure that the p brake is fully released, so there must be a leak in the system or low fliud level. Correct? Thanks for all of the info
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Esteban86K5
1/2 ton status
You probably have a slow leak and the fluid finally dropped low enough to trigger the light.
sandawgk5
3/4 ton status
Mine came on when I had a bad hose on a front caliper when I pushed the pedal it pushed all the fluid out and the pressure diff tripped the light.
Ira
Ira
I had the same problem in my '91 k5. Didn't think much about it untill i was driving down a country road and hit my cruise control, everthing was going fine untill i saw a stop sign ahead. I engaged the brake but the cruise would not disengage! My quick action allowed me to hit the off switch on the cruise control and I was able to break. Well it turns out I had a blown taillight fuse. This casue the dash brake light to stay on. And with out rear break lights the cruise will not deactivate. So a 50 cent fuse almost caused me to wreck! So you may want to check and see when you push your break pedal that your tail lights are lighting up.
I too have the dreaded brake light on option installed in my truck 
it is not low fluid in mine... did this before i even went to disc brakes too.... I just ignore it right now.....but someday gotta fix it.. some times I look down and it is off and some times it is on....
it is not low fluid in mine... did this before i even went to disc brakes too.... I just ignore it right now.....but someday gotta fix it.. some times I look down and it is off and some times it is on....
