Question about 2005 Peugeot 405
Brake lights are controlled by one of two means; a switch, normally located under the dashboard which is operated by the brake pedal suspension or a pressure sensitive switch that monitors the hydraulic fluid pressure of the braking system.
The first switch makes contact when the pedal is pushed, the second, when pressure rises in the braking system. .
Either way, the switch has probably failed or is the first type, the pedal is not returning all the way to its stop therefore leaving the mechanical switch in its 'on' mode.
Check for the mechanical switch first under the dash and press the brake pedal just with your hand while you are watching the suspension to see if when you let go of the pedal that it returns to its stop.
Once you let go of it, lift it to see if there is still a distance to the pedal stop.
I have seen this kind of switch get worn or sticky and prevent the pedal suspension from returning completely which will keep the brake lights on.
If you find no mechanical switch under the dash, locating a pressure switch is more difficult since it is likely under the hood and perhaps not easily seen.
You might need a Peugeot mechanic to locate it for you.
Posted on Jul 03, 2008
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Posted on Jan 02, 2017
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