Ford F87Z-13480-AA Switch Assembly - Stop Light

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The brake light switch, also known as the brake pedal position switch or brake light switch, informs the PCM when the brakes are being applied. This switch closes when brakes are applied and opens when they are released, and is mounted on the brake pedal. The brake light circuit is controlled by this switch, and issues such as burned-out bulbs or other circuit problems can cause the engine to idle roughly. Therefore, it's important to check the brake light switch operation when troubleshooting any rough-idle problems. To identify the functions of connector terminals, wiring diagrams can be used. Disconnect the switch connector and connect your voltmeter positive (+) lead to the connector terminal that provides battery positive (B+) voltage to the switch. Connect the negative (-) meter lead to a good ground. Turn the ignition On and read the meter. It should indicate more than 10 volts or close to battery voltage. Connect an ohmmeter to the switch terminals and manually open and close the switch. The meter should alternate from continuity to an open-circuit reading as the switch is opened and closed. Also, check continuity from the switch to the brake light bulbs. Replace any burned-out bulbs or damaged wire looms. Replacement of the switch is covered.

The Anti-lock brake system is to enable the vehicle to have manoeuvrability and direction stability, and enhance the best degree of deceleration in extreme braking situation on most surfaces of the road by constantly detecting the rate of the wheel's rotational speed and controlling the brake hydraulic pressure to avoid early locking of the wheels. Two types of systems are utilized: Rear Wheel Anti-lock Brake System (RABS): Controls lock-up on the rear wheels 4-Wheel Anti-lock Brake System (4WABS): Lock-up prevention on all 4 wheels Hydraulic control unit is placed in the left front corner of the engine compartment and the control module, which is considered to be the 'brain' of the system, takes analog voltage inputs from the speed sensors to regulate the hydraulic line pressure and to prevent the wheels from locking up. The engine control module and the transmission control module are always on the lookout for system faults, which trigger the ABS warning light and may even turn off the anti-lock system if the problem is severe enough; a diagnostic trouble code is retained for the technician. A speed sensor produces an analog voltage signal that must be processed into digital data by the control module to measure wheel rotation speed; there is one rear wheel speed sensor in the differential housing and the extra front-wheel sensors in 4WABS. The brake light switch informs the control unit when the brake pedal is depressed to turn on the anti-lock system which is turned off when the brake pedal is released. Preliminary checks for the ABS warning light on, should include checking if the parking brake is on, checking the condition of the brake pads and calipers, inspecting the electrical connectors on the control unit, checking fuses for the system, making sure there are secure connections and no damaged wires to the speed sensors as well as brake light switch. In the event that these checks do not settle the problem, then it is advisable to seek professional diagnosis.

The brake light switch, also known as the brake pedal position switch or brake light switch, informs the PCM when the brakes are being applied. This switch closes when brakes are applied and opens when they are released, and is mounted on the brake pedal. The brake light circuit is controlled by this switch, and issues such as burned-out bulbs or other circuit problems can cause the engine to idle roughly. Therefore, it's important to check the brake light switch operation when troubleshooting any rough-idle problems. To identify the functions of connector terminals, wiring diagrams can be used. Disconnect the switch connector and connect your voltmeter positive (+) lead to the connector terminal that provides battery positive (B+) voltage to the switch. Connect the negative (-) meter lead to a good ground. Turn the ignition On and read the meter. It should indicate more than 10 volts or close to battery voltage. Connect an ohmmeter to the switch terminals and manually open and close the switch. The meter should alternate from continuity to an open-circuit reading as the switch is opened and closed. Also, check continuity from the switch to the brake light bulbs. Replace any burned-out bulbs or damaged wire looms. Replacement of the switch is covered.

Remove under dash panel. Locate brake light switch near top of brake pedal and disconnect from pedal by removing retaining clip. Use screwdriver to unlock electrical connector, then unplug from switch. Use screwdriver to disengage locking tab from connector. Install switch to connector by snapping clip into place. Reconnect assembly to pedal. Install under dash panel. Check brake lights for proper operation.

To replace the Vehicle Speed Sensor (VSS) on 1997 and earlier models, disconnect the electrical connector, remove the retaining bolt, and reverse the procedure.

You should check the brake lights for proper operation.

Remove the under dash panel.

The manufacturer refers to the brake light switch as the brake on-off (or BOO) switch because it also functions as a digital information switch for the powertrain control module.

Install the under dash panel.

Snap the clip into place.

When the brake pedal is depressed, the switch closes the circuit and sends current to the brake lights.

The switch is located at the upper end of the brake pedal, at the connection between the pedal pin and the power brake booster pushrod. To access the switch and connector, you need to remove the trim panel beneath the steering column.

Remove the hairpin retainer and spacer securing the switch to the brake pedal arm.

Connect the electrical connector to the switch. Make sure the electrical connector is routed correctly and will travel the full swing of the pedal without binding.

Snap the clip into place.