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<h2>What is a brake light switch?</h2>
&nbsp;The primary function of the brake light switch is to activate the brake lights when the brake pedal is pressed. When you apply pressure to the brake pedal, the switch is triggered, completing an electrical circuit and causing the brake lights to illuminate.&nbsp;In many modern vehicles, the brake light switch is also integrated into the shift interlock system. This means that the switch must be engaged (brake pedal pressed) to allow the driver to shift out of "Park" and into another gear, such as "Drive" or "Reverse." This interlock system prevents accidental shifting when the brake pedal is not depressed.
In some vehicles equipped with cruise control, the brake light switch is used to deactivate the cruise control system when the brakes are applied. This safety feature ensures that the vehicle slows down when the driver applies the brakes while using cruise control.
<h2>Symptoms of a bad brake light switch</h2>
<ol>
<li>Brake lights fail to illuminate</li>
</ol>
Brake lights do not light up when the brake pedal is pressed, risking safety.
<ol start="2">
<li>Shifting difficulty</li>
</ol>
Difficulty shifting out of "park" even with the brake pedal pressed.
<ol start="3">
<li>Cruise control issues</li>
</ol>
Cruise control may not disengage when brakes are applied.
<ol start="4">
<li>Dashboard warning lights</li>
</ol>
Activation of abs or traction control warning lights on the dashboard.
<ol start="5">
<li>Battery drain</li>
</ol>
A stuck switch can drain the vehicle's battery due to continuous brake light illumination.
<ol start="6">
<li>Transmission shift problems</li>
</ol>
In automatic vehicles, it can hinder gear shift release from "park".
<ol start="7">
<li>Intermittent brake lights</li>
</ol>
Brake lights may work inconsistently.
<ol start="8">
<li>Visible damage</li>
</ol>
Check for physical damage or wear on the switch or electrical connections.

Brake Light Switch

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Air Filter Box

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Air Flow Sensor

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Air Intake Duct

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Air Intake Hose

Air Intake Manifold Actuator Control Solenoid

Air Intake Manifold Flap Adjuster

Air Intake Manifold Runner Control Sensor

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Electric Vacuum Pump

Engine Air Duct Assembly

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Engine Air Filter

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Intake Manifold

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Intake Manifold Flap Actuator

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Intercooler

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Oxygen Sensor

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Pressure Sensor

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Throttle Body

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Throttle Position Sensor

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Turbocharger

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Turbocharger Oil Line

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Vacuum Pump

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Air Filters & Intake Systems

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Camshaft Adjuster

Camshaft Adjuster Cover

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Camshaft Timing Gear

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Camshafts

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Engine Valve Cover

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Harmonic Balancer

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Timing Belt Kit

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Timing Chain Kit

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Timing Cover

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Timing-Control Valve Solenoid

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Valve Lifters Tappet

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Cams, Timing & Valvetrain

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Belt Tensioner

Coolant Level Sensor

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Crankcase Breather Hose

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Crankcase Breather Valve

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Crankshaft Position Sensor

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Engine Oil Dipstick Tube

Engine Oil Filter

Engine Oil Pan Gasket

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Flywheel

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Oil Cooler

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Oil Cooler Line

Oil Filler Cap

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Oil Filter

Oil Filter Base

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Oil Filter Housing

Oil Filter Housing Cover

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Oil Level Sensor

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Oil Pan

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Oil Pump

Oil Pump Drive Gear Shaft

Oil Pump Pickup Tube

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Cranks, Pistons, Oil & Components

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Camshaft Position Sensor

Camshaft Position Sensor & Magnet Kit

Connector Plug

Distributor Cap

Engine Valve Covers & Ignition Coils Kits

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Glow Plug Relay Module

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Ignition Coil

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Ignition Coils & Spark Plugs Kits

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Ignition Distributor

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Ignition Starter Switch

Ignition Switch Actuator

Knock Detonation Sensor

Relay

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Spark Plug

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Spark Plug Wire

Electronic Control Modules, Ignition & Distributors

Engine Wiring Harness

Intake Manifold Repair Kit

Engine Components & Accessories

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Auxiliary Water Pump

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Expansion Tank

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Expansion Tank Mounting Plate

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Fuel Cooler

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Radiator

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Radiator Hose

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Radiator Support Assembly

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Temperature Sensor

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Turbo Hose

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Water Coolant Pipe

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Water Outlet

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Engine Cooling

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Engine Mount

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Engine Mounts

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Catalytic Converter

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EGR Valve

Emissions Fluid Pump

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Exhaust Fluid Heater

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Exhaust Gas Temperature Sensor

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Exhaust Manifold

Fuel Tank Breather Valve

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Fuel Vapor Leak Detection Pump

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Nitrogen Oxide Sensor

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Secondary Air Injection Check Valve

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Vapor Canister Vent Solenoid

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Exhaust & Emission Systems

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Fuel Filter

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Fuel Injection Control Module

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Fuel Injection Pressure Regulator

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Fuel Injector

Fuel Injector Kit

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Fuel Injector Module Wiring Harness

Fuel Line Kit

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Fuel Pump

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Fuel Sending Unit

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Fuel Tank Filler Neck Pipe

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Fuel Tank Strap

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High Pressure Fuel Pump

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Fuel Systems & Components

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The engine comprises many essential elements such as the lower cylinder block, upper cylinder head(s), and the cooling & lubricating systems. With A-Premium aftermarket engine components, you can expect that your engine deliver years of reliable performance. We offer a diverse selection of engine components from air filters and ignition coils (kits) to fuel pumps to cater to your needs.

Ford Grand Marquis Brake Light Switch