Your Guide to the 1966-1979 Chevrolet Caprice Brake Light Switch
Solve common brake light problems and keep your classic Caprice safe and reliable on the road.
- A faulty brake light switch is a critical safety failure that must be addressed immediately.
- Symptoms are clear: brake lights won't work, stay on, or work intermittently.
- Replacement is a simple, fast, and inexpensive DIY job for most owners.
- Choose a quality aftermarket brand like Standard Ignition for long-term reliability; ensure the part matches your car's cruise control option.
Is Your Brake Light Switch Failing?
A faulty brake light switch is a major safety concern, but the signs are usually straightforward. Because this is a simple mechanical switch, failures are typically complete and easy to spot. Look for these common symptoms:
- Brake Lights Don't Turn On: This is the most dangerous symptom. If the switch fails in the open position, it cannot complete the circuit to illuminate the lights.
- Brake Lights Stay On: If the switch gets stuck or shorts in the closed position, it will continuously send power to the brake lights, even when the car is off. This will drain your battery and confuse other drivers.
- Intermittent Brake Lights: Worn internal contacts can cause the lights to flicker or work only some of the time. This is also a serious safety issue.
- Cruise Control Issues: On Caprice models with cruise control, a bad switch might prevent the system from deactivating when you press the brake pedal.
Safety First
Driving with brake lights that don't work is illegal and extremely dangerous. If you suspect your brake light switch has failed, diagnose and replace it immediately before driving the vehicle.
Choosing the Right Aftermarket Switch
For a classic vehicle like the 1966-1979 Caprice, original GM-manufactured (OEM) parts are generally unavailable. The market consists of aftermarket manufacturers who produce new replacement parts. Your choice comes down to quality and price.
Professional-Grade (e.g., Standard Ignition): Standard Motor Products (SMP), often sold under the "Standard Ignition" brand, is a highly respected name in the aftermarket industry. They have been making quality replacement parts for over 100 years and are trusted by professional technicians. These switches are engineered to meet or exceed original specifications and are known for their durability and reliability.
Economy-Grade (e.g., Skyward): Brands like Skyward offer a more budget-friendly option. These parts are designed to be a functional, cost-effective replacement. While they meet the basic requirements to get your brake lights working, they may not have the same long-term durability or precise construction as premium brands.
Pro Tip: Check for Cruise Control
When ordering, make sure you select the correct switch. Some Caprice models were equipped with cruise control, which requires a switch with additional electrical contacts. Using the wrong switch can result in the cruise control system not functioning correctly.
Cost of Replacing a Brake Light Switch
| Item | Estimated Cost |
|---|---|
| New Aftermarket Part | $5.40 - $29.97 |
| Shop Labor | $50 - $100 |
| Total Estimated Cost (at a shop) | $55 - $130 |
Note: Labor costs are estimated based on a 0.5-hour job at a typical independent shop rate. DIY replacement avoids this cost entirely.
Frequently Asked Questions
Is replacing the brake light switch a difficult job?
No, this is a very easy DIY task for most owners. The switch is located under the dashboard, right above the brake pedal. It typically involves disconnecting the battery, unplugging the electrical connector, and unscrewing or unclipping the old switch to install the new one. The entire job usually takes less than 30 minutes.
Why are my brake lights stuck on?
This usually happens when the brake light switch fails in the "on" or closed position, constantly sending power to the lights. It could be an internal short in the switch or a problem with the plunger mechanism. This will drain your battery if not fixed.
My brake lights flicker. Is the switch the problem?
Intermittent brake lights are a classic sign of a failing brake light switch with worn internal contacts. Before replacing the switch, it's also a good idea to check the bulb sockets and ground connections for corrosion, especially on a classic car.
What's the difference between a cheap and an expensive switch?
The price difference usually reflects the quality of materials and manufacturing. A more expensive switch from a brand like Standard Ignition is built for longevity and reliability. A cheaper switch will work, but may fail sooner. For a critical safety component like a brake light switch, investing in a quality part is often worth the small extra cost.
Do I need to adjust the new switch?
Yes, adjustment is often necessary. The switch is typically threaded and held by a locknut, allowing you to move it closer or further from the pedal arm. The goal is to have the brake lights turn on the moment you begin to press the pedal and turn off completely when it's released.
Technical Specifications
OEM Part Numbers: SLS-66 25524848 25524845
Typically a 2-terminal or 4-terminal plunger-style switch mounted to the brake pedal support bracket. The 4-terminal version is for vehicles equipped with cruise control.
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.