1942 Hudson Commodore Series 24 Brake Light Switch Guide
Everything you need to know about replacing the brake light switch on your classic Hudson.
- The 1942 Hudson uses a hydraulic pressure switch, which can fail by either not turning the lights on or leaving them stuck on.
- Failure is a critical safety issue and should be addressed immediately.
- A new aftermarket switch from a reputable brand like Standard Ignition is the most reliable and available option.
- Replacing the switch requires bleeding the brake system afterward to remove air from the lines.
Is Your Hudson's Brake Light Switch Failing?
For a vehicle like the 1942 Hudson Commodore, the brake light switch is a straightforward part, but its failure can cause serious safety issues. The most common symptoms are easy to spot.
Symptoms of a Bad Brake Light Switch
- Brake Lights Don't Turn On: This is the most dangerous symptom. If the switch fails in the open position, it will not complete the circuit, and your brake lights will not illuminate when you press the pedal.
- Brake Lights Stay On: If the switch shorts internally or gets stuck in the closed position, it can cause the brake lights to remain on even when you are not braking. This can drain your battery and confuse other drivers.
On older hydraulic switches, problems like sticking or delayed activation are common. You might notice that you have to press the brake pedal very hard to get the lights to come on, or they might stay on for a while after you've released the pedal. This is a sign the internal mechanism is wearing out.
Choosing the Right Aftermarket Replacement
For a 1942 vehicle, finding original "New Old Stock" (NOS) parts is extremely difficult and often not practical. The materials in an 80-year-old switch may have degraded over time. A modern aftermarket replacement is the most reliable and available choice.
Available Brand: Standard Ignition
Currently, the primary brand manufacturing a new replacement brake light switch for the Commodore Series 24 is Standard Ignition (also known as SMP). Standard is a well-known company that has been making quality replacement parts for over 100 years. Their parts are designed to meet or exceed original specifications, using modern materials that offer durability and a long service life. For classic cars, a new part from a reputable manufacturer like Standard is generally a safer bet than a used or NOS part of unknown condition.
Replacement Part Cost
| Part Type | Price Range |
|---|---|
| New Aftermarket (Standard Ignition) | $15.52 |
| New OEM | Not Available |
| Used OEM / NOS | Varies widely, hard to find |
Pro Tip: Installation
Replacing a hydraulic brake light switch is usually straightforward. It typically unscrews from the master cylinder or a junction in the brake lines. However, because it is part of the hydraulic system, you will introduce air into your brake lines when you remove it. After installing the new switch, you must bleed the brakes to remove this air and ensure your brakes function safely. If you are not comfortable bleeding brakes, it is best to have a professional mechanic perform the replacement.
Frequently Asked Questions
Where is the brake light switch located on my 1942 Hudson?
On most cars from this period, the brake light switch is a hydraulic pressure switch screwed directly into the master cylinder under the hood or floor, or into a brake line junction block along the frame. A 1942 Hudson wiring diagram confirms a "Stop Lamp Switch" in the electrical system.
Can I just repair my old switch?
These switches are sealed units and are not designed to be repaired. Given the low cost of a new replacement and the critical safety function of the part, replacing it is always the recommended course of action.
Do I need any special tools to replace it?
You will need a basic wrench (often a flare-nut wrench is best to avoid rounding the fitting) to remove and install the switch. You will also need tools for bleeding your brakes, which includes a wrench for the bleeder screws on your wheels and a container to catch the old fluid.
Is a modern switch better than the original?
Yes. Modern manufacturing processes and materials often make new aftermarket switches more reliable than original-style parts. Some classic car owners even modify their vehicles to use a more modern mechanical switch at the pedal for faster and more reliable activation. However, a new hydraulic switch from a brand like Standard Ignition is an excellent direct-fit replacement that maintains the original design.
Technical Specifications
Activation Style: Hydraulic Pressure, Terminal Type: 2-Terminal Screw-In or Bullet (varies by specific part).
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.