1961 Studebaker 6E12 Brake Light Switch Guide
Keep your classic Studebaker truck safe and visible by understanding how to diagnose and replace its unique brake light switch.
- The 1961 6E12 uses a hydraulic pressure switch, not a mechanical pedal switch.
- Failure is critical as it can leave you with no brake lights. Test your lights often.
- Replacement is simple, but you must bleed the brake system afterward.
- The available Standard Ignition switch is a reliable choice but should not be used with silicone brake fluid.
Understanding Your Studebaker's Brake Light Switch
The 1961 Studebaker 6E12 truck uses a type of brake light switch that was common on most American vehicles from the 1930s through the late 1960s. It is a simple, two-terminal hydraulic switch that relies on fluid pressure to operate. This is different from modern vehicles that use a mechanical switch at the brake pedal. Because of its location in the hydraulic brake system, replacing it requires a little more than just swapping a part; you will also need to bleed the brakes afterward.
Symptoms of a Failing Brake Light Switch
When this switch fails, it typically does so in one of two ways. You should check your bulbs and fuses first, but if they are fine, the switch is a likely culprit.
- Brake Lights Do Not Turn On: The most common and dangerous symptom is when the brake lights fail to illuminate when you press the brake pedal. This happens when the switch's internal contacts wear out and can no longer complete the electrical circuit.
- Brake Lights Stay On: Less common, but still a problem, is when the switch fails in the 'on' position. This will cause your brake lights to stay lit even when your foot is off the pedal, which can confuse other drivers and drain your battery.
Known Issues with Hydraulic Switches
Owners of many classic cars, including Studebakers, sometimes report frequent failures of aftermarket hydraulic brake light switches. Some believe this is related to the use of modern silicone brake fluid, which can potentially damage the switch's internal diaphragm. The available Standard Ignition switch is not recommended for use with silicone brake fluid. For this reason, many owners who convert to silicone fluid also modify their vehicles to use a mechanical pedal switch, though this requires custom fabrication.
Choosing the Right Aftermarket Switch
For a 1961 vehicle, finding a "New Old Stock" (NOS) OEM part is difficult and often expensive. The most practical and reliable option is a new aftermarket part from a reputable brand.
Standard Ignition: This is a well-known brand that has been producing quality automotive electrical parts for a long time. Their replacement switch is designed to meet the original form, fit, and function. It is a direct-fit replacement that will screw into the original location and accept the factory wire connections. Given the simplicity of the part, a quality aftermarket version from a brand like Standard Ignition is a dependable choice for your Studebaker truck.
| Part Type | Estimated Cost |
|---|---|
| New Aftermarket (Standard Ignition) | $15.52 |
| New OEM / NOS | Not commonly available |
| Shop Labor (including brake bleeding) | $100 - $200 |
Pro Tip: Test Before You Replace
You can quickly test if the switch is the problem. Locate the switch on the master cylinder or frame rail and disconnect the two wires. Use a small jumper wire to connect the two wire terminals together. If the brake lights turn on, the switch is faulty. If they do not, the problem lies elsewhere in the wiring or bulb sockets.
Frequently Asked Questions
Where is the brake light switch located on my truck?
Follow the brake lines from the master cylinder. The switch is a small, two-wire component screwed either directly into the master cylinder or into a junction block on the frame where brake lines connect.
Is this a difficult part to replace myself?
The replacement itself is easy: you just unscrew the old switch and screw in the new one. However, because this opens the hydraulic brake system, you MUST bleed the brakes afterward to remove any air that has entered the lines. If you are not comfortable bleeding brakes, you should have a professional mechanic do the job.
Are there any recalls for the brake light switch on a 1961 Studebaker?
No. There are no active recalls or Technical Service Bulletins (TSBs) from the NHTSA for this part on your vehicle. This is normal for a vehicle of this age.
Do I need a special tool to replace the switch?
You will need a standard open-end wrench (line wrench is preferred to avoid stripping) to remove and install the switch. You will also need tools for bleeding your brakes, which typically includes a wrench for the bleeder screws and a catch bottle with a hose.
Technical Specifications
OEM Part Numbers: 666858
Hydraulic pressure activated, 2-terminal, 1/8-inch NPT thread.
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.