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Brake lights on while car is off??? Rn

11K views 28 replies 16 participants last post by  aaronw0813  
#1 ·
Why is this happening this is gonna kill my battery
 

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#6 ·
and this can happen even if the car’s shut off??
I thought I had something to do with the tail light fuses trying to find them right now
Only thing with the fuses would be if they blew the lights wouldn’t work at all. It’s either a switch issue or a relay issue. Not sure if/where the relay is, start by checking the switch
 
#5 ·
Brake lights will always be able to work even if the car is off, unplug the brake pedal switch and see if they turn off, or try press the switch in further with something and see if they go off.
 
#7 ·
My bet is on the little rubber cushion that conacts the stop lamp switch crumbling apart like Dudewithoutapet said. Pull the STOP fuse until you get it fixed unless you want to melt the plastic bulb holders.

 
#11 ·
The switch is touching part of the brake pedal when the pedal is up, and the cushion is on the brake pedal. So, the switch is mounted to the rear side of the pedal closer to the back of the car direction.
 
#15 · (Edited)
For safety, any failure in brake-light mechanicals or circuit will cause brake-light to turn on. Better than applying your brakes and having no lights turn on. Might get rear-ended that way.

So by default, brake lights are ON. Letting up on brake-pedal pushes on switch at top of travel and turns light OFF. Push on pedal, releases switch and circuit changes to default ON.

In this case, broken cushion button prevents pushing on switch to turn OFF brake lights. Thus circuit stays in default ON state.

Seems countre-intuitive since pushing on switch closes circuit in most cases. But in this one, pushing on brake-pedal switch opens circuit and cuts power.
 
#16 ·
I just unhooked my battery when not driving, until the part came in - the dealer had to get it shipped, and this was like eight years ago or something.

Even if the corovid thing doubled the price, you'll still get change from a five dollar bill...
For safety, any failure in brake-light mechanicals or circuit will cause brake-light to turn on.
Kind of like the cooling fan on the radiator - if the switch fails, the fan stays on.
 
#24 ·
I put a bolt with a nut in the hole on the pedal where the broken plastic piece was. The head of the bolt was where the plastic piece used to be. Guarantee it will never fail again. I would think over time with heat, cold and vibration, anything glued or taped to the pedal will fail again in time.
 
#25 ·
Yes, but if the bolt sticks out farther than the rubber cushion did they it could put more pressure on the switch and eventually damage the switch. The metal bolt contacting the plastic part of the switch could also do damage from rubbing over time. You're solution may last a very long time, but maybe not as long as the correct rubber cushion which lasts 20+ years