1958 Studebaker 3E7D Brake Light Switch: A Complete Guide
Everything you need to know about replacing the brake light switch on your classic Studebaker truck.
- The brake light switch on a 1958 Studebaker 3E7D is a hydraulic pressure switch, not a mechanical one at the pedal.
- Common failure symptoms are brake lights that don't work, stay on, or flicker.
- Replacement is a simple DIY task, but be prepared to bleed the brakes after installing the new switch.
- New aftermarket switches from brands like Standard Ignition are a reliable and affordable option.
Signs of a Failing Brake Light Switch
For a straightforward truck like the 1958 Studebaker 3E7D, the symptoms of a bad brake light switch are usually obvious. Because the electrical system is simple, diagnosis is also easy. Always check your bulbs and fuses first before deciding the switch is the problem.
- Brake Lights Don't Work: This is the most common and dangerous symptom. If the bulbs and fuse are good, the switch is the most likely cause. The internal parts can wear out or corrode, preventing it from sending power to the lights.
- Brake Lights Stay On: The switch can also fail in the 'on' position. This will keep the brake lights lit even when you're not braking, which can confuse other drivers and drain your battery when parked.
- Flickering Brake Lights: If the lights flicker when you press the pedal or drive over bumps, the switch is likely worn out and making an inconsistent connection.
A Note on Silicone Brake Fluid
Many classic car owners switch to DOT 5 silicone brake fluid. However, some owners in Studebaker forums report that reproduction hydraulic switches can fail prematurely when used with silicone fluid. If you use DOT 5 fluid, be aware of this potential issue. Some owners modify their trucks to use a mechanical switch for better reliability with silicone fluid, but this requires custom work.
Choosing the Right Aftermarket Part
For a vehicle of this age, finding original parts from Studebaker is not an option. Your choice is between a New Old Stock (NOS) part and a new aftermarket part. Given the simplicity of a brake light switch, a modern aftermarket part is a reliable and affordable choice.
Standard Ignition is a well-known brand that produces replacement switches for your truck. For a simple component like this, their products are a dependable option and are widely available.
Cost Comparison
| Part Type | Estimated Cost |
|---|---|
| New Aftermarket (Standard Ignition) | $15 - $20 |
| Shop Labor | $50 - $100 |
Pro Tip: Test Before You Replace
You can easily test your old switch. First, make sure the bulbs and fuse are good. Then, find the switch on the master cylinder or brake line block. Unplug the two wires and touch them together with a small jumper wire. If the brake lights turn on, the switch is bad. If they don't, the problem is elsewhere in the wiring.
Frequently Asked Questions
Where is the brake light switch located on my 1958 Studebaker 3E7D?
The brake light switch is a hydraulic pressure switch. It is not inside the cab by the pedal. Look for it screwed into the brake master cylinder or a nearby brake line junction block under the truck. It will have two wires connected to it.
Is it difficult to replace the brake light switch myself?
No, this is a simple job for a DIY mechanic. It involves unscrewing the old switch, applying thread sealant to the new one, screwing it in, and reconnecting the two wires. You will need to bleed the brakes afterward to remove any air that entered the system. The entire job should take less than an hour.
Are there any recalls for this part?
No recalls or technical service bulletins (TSBs) were found for the brake light switch on a 1958 Studebaker 3E7D. This is normal for a vehicle of this era, as the modern NHTSA recall system was established much later.
Is an aftermarket switch as good as the original?
Yes. For a simple part like a hydraulic switch, modern manufacturing often produces a part that is just as reliable, if not more so, than the originals from the 1950s. Brands like Standard Ignition are a trusted choice for these components.
Technical Specifications
Hydraulic pressure activated, 2-terminal, 1/8" 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.