Many have replaced the XF brake switch, thought this article might help some?

Credit given below.

A Switch for Every System



*Samples*


Typical Brake Light Switches. A more comprehensive name for "Brake Light Switch" could now be "Switch for Every System that Needs to Know When the Driver's Foot is on the Brake Pedal." Brake lights, cruise (speed) control, transmission shift interlock, ABS and hill descent control are just some of the systems that rely on input from the Brake Light Switch.

A Brake Light Switch typically includes a spring-loaded plunger or lever that is released when the driver's foot pushes on the brake pedal. Releasing the plunger usually connects the electrical terminals (closes the switch) that turn on the brake lights while disconnecting other terminals (opening the switch) to turn off systems like cruise control.

For many years, the evolution of the Brake Light Switch seemed to lean towards adding more electrical blade terminals/pins. The Brake Light Switch had two terminals for the brake lights, got two more terminals for cruise control and got two additional terminals for the transmission shift interlock (brake pedal must be pushed to put the transmission in gear).

Mercifully, computers came along and made it unnecessary for car manufacturers to turn the Brake Light Switch into an expensive mechanism bristling with electrical terminals. A simple, inexpensive switch could signal the computer that the brake pedal was being depressed, and then the computer could use that info to decide what other switches, relays, etc. to activate to turn various systems on or off. Many Brake Light Switches on newer vehicles actually have fewer electrical terminals than cars built during the prior century.

Worn out Brake Light Switches are usually easy to replace on both old and newer cars; find the switch near where the brake pedal arm hinges, turn the switch to pop it out of its bracket and unplug the electrical connector.

Vehicles with manual transmissions may have a separate Cruise Control Release Switch mounted on the clutch pedal to turn off cruise control when the clutch pedal is pushed. Be careful not to confuse the similar looking switches mounted on the brake and clutch pedal mechanisms. I know I sometimes get a little disoriented when working under the dash and may accidentally mix up things like clutch/brake, right/left and up/down.

See the Brake Light Switch and other mechanical switches prone to wear for your specific vehicle under "Electrical-Switch & Relay" in the RockAuto.com catalog.

Tom Taylor,
RockAuto.com


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