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The brake light switch is responsible for activating the brake lights when the brake pedal is pressed. Another brake light switch function is to switch cruise control OFF and provide the signal to unlock the shift interlock solenoid.
The brake pedal switch can fail a few different ways. You may have a brake light warning lamp illuminate in your instrument cluster, indicating a problem with the brake light circuit. If none of the brake lights illuminate and the fuse is fine, the brake light switch is most likely the cause. However, be sure to check the rear light warning module, located in the rear side panel of the luggage compartment. See our tech article on the rear light warning module for more information. A few things to remember when checking your brake light switch: check the fuse (find location using fuse index in fuse panel), check brake light switch adjustment, (see steps below for how to adjust), inspect brake light bulbs and use a high impedance digital volt ohm meter (DVOM) when testing the circuit.
The brake light switch is mounted in front of the brake pedal. In this tech article, I will go over how to replace and adjust the brake light switch on Volvo V70 vehicles.
Remember that your car may have been serviced before and had parts replaced with different size fasteners used in the replacement. The sizes of the nuts and bolts we give may be different from what you have so be prepared with different size sockets and wrenches.
Protect your eyes, hands and body from fluids, dust and debris while working on your vehicle. If you"re working with the electrical system, disconnect the battery before beginning. Always catch fluids in appropriate containers and properly dispose of any fluid waste. Recycle parts, packaging and fluids when possible. Never work on your vehicle if you feel the task is beyond your ability.
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Our vehicle may vary slightly from yours as models do change and evolve, as they grow older. If something seems different, let us know and share your info to help other users. Do you have questions or want to add to the article? Leave a comment below. When leaving a comment, please leave your vehicle information.