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It's near the brake pedal or brake light switch.... It deactivates cruise control
This device is the focus of a few different questions - from the symptoms caused by a leaking switch, to the TSB (Technical Service Bulletin) detailing the problem with the leaking switch.See "Related Questions" and "Related Links" below for detailed / photo how-to guides to replace the switch, and a website dedicated to the problems caused by, and how to make repairs.
Located in the brake pedal assembly
I believe that used to be called the brake pressure switch and is now called the speed control deactivation switch ( even if you don't have cruise / speed control )
2002 and earlier Speed control deactivation is located on the brake master cylinder; its round and looks like some of the old oil pressure switces. These were recalled due to fire concerns. 2003 and later has this switch removed. The only connection on the master cylinder is a level switch. The Speed Contol Deactivation switch on the newer Expeditions has been relocated on the left side of the brake pedal and it contacts an "L" bracket on the brake pedal. This is a self-adjusting switch meaning, if you accidently press it in too far, the brake pedal will not depress the switch far enough to power the cruise control system. Nothing will work; the system thinks you are pressing the brake pedal, so it shuts down. To check this, disconnect the plug at the Cruise control servo on the driver's side fender well area. Check for 12 volts as pin #6 (should be a 6-pin plug with #6 pin being black with yellow stripe). If you have no volts with the key on or engine running, then deactivation switch is the target. If the switch plunger has been adjusted to far in, you may be able to pull the plunger out (should be about 1 to 1.5 inch stciking out), but more than likely you will break it trying. The newer switches have a knob on the back that will release the plunger when turned counter-clockwise. The plug on this switch is a 2-pin plug--if you are not getting 12 volts at pin 6 at the swervo, you can short the 2 pins of the cruise deactivation switch together and recheck for 12 voltas at pin 6, if the voltage is now there, then the deactivation switch is the problem. Either replace, or hope for the best trying to adjust it.
how to replace the brake light switch at the pedal of a 2001 ford zx2
look on the brake pedal you will see a lil switch there that's the brake light switch
brake light switch is mounted by the brake pedel remove lower panel above brake pedel and then you will see the switch should be able to turn the switch to replace
The brake light switch is not air actuated.
The brake pedal switch is bad. How do I replace it?
you can find the switch on the back of the brake pedal.
The brake light switch, on a Dodge neon, can be found under the dashboard just below the steering column. The brake light switch just unplugs. Unplug the switch and replace with a new one.