1935 Oldsmobile L-35 Brake Light Switch Replacement and Diagnosis
A guide to diagnosing and replacing the brake light switch on your classic 1935 Oldsmobile L-35.
- A faulty brake light switch is a critical safety issue and should be replaced immediately.
- For a 1935 model, a new aftermarket part from a reputable brand like Standard Ignition is the only reliable option.
- Replacement is a simple, low-cost job that a DIY-er can typically complete in under an hour.
- Always check the bulbs and fuses before condemning the switch.
Diagnosing a Faulty Brake Light Switch
For a vehicle like the 1935 Oldsmobile L-35, the electrical system is straightforward. If your brake lights are not working, the switch is a likely culprit, but it's wise to check other components first. Before blaming the switch, inspect the brake light bulbs to ensure they haven't burned out. Also, check the fuse and the wiring leading to the lights for any obvious damage or loose connections.
Symptoms of Failure
The signs of a failing brake light switch are usually very clear. The most common issues you will encounter are:
- Brake Lights Do Not Turn On: The most serious symptom is a complete failure of the brake lights to illuminate when you press the pedal. This is a major safety hazard.
- Brake Lights Stay On: The switch can fail in the 'on' position, causing the brake lights to remain lit even when the pedal is not being pressed. This can confuse other drivers and will drain your vehicle's battery.
- Intermittent Operation: The lights may flicker or only work when you press the brake pedal with excessive force. This often points to worn internal contacts in the switch.
Choosing the Right Aftermarket Part
For a vehicle manufactured in 1935, finding original equipment manufacturer (OEM) parts is no longer possible. Your only practical and reliable option is a new aftermarket part. Used switches from other classic cars are not recommended due to their age and unknown condition.
Brand Availability: Standard Ignition
The primary brand available for this application is Standard Ignition (also known as Standard Motor Products or SMP). Standard has been producing automotive parts for over 100 years and is a well-established name in the aftermarket industry. Reviews for their switches are generally positive, making them a reliable choice for keeping your classic Oldsmobile on the road safely.
Brake Light Switch Replacement Overview
Replacing the brake light switch is a job that most owners can do themselves with basic tools. The switch is typically located under the dashboard, mounted on a bracket near the top of the brake pedal arm.
- Disconnect the Battery: Before working on any electrical component, always disconnect the battery to prevent short circuits.
- Locate the Switch: You will need to look under the dashboard in the area where the brake pedal is mounted. The switch has two electrical wires connected to it. Getting to it may require you to be in an awkward position.
- Disconnect and Remove: Carefully unplug the two wires from the switch. Then, unbolt the switch from its mounting bracket.
- Install the New Switch: Bolt the new switch into place. You may need to adjust its position so that the plunger is fully depressed when the brake pedal is at rest, and released as soon as the pedal is pressed.
- Reconnect and Test: Reconnect the wiring and then reconnect the vehicle's battery. Have a helper stand behind the car to confirm that the brake lights illuminate when you press the pedal and turn off when you release it.
Pro Tip: Adjustment is Key
Before you assume a new switch is faulty, double-check its adjustment. The switch must be positioned so the pedal arm allows the plunger to move correctly. Even a small amount of incorrect placement can prevent the lights from working properly.
Frequently Asked Questions
Where is the brake light switch located on my 1935 Oldsmobile L-35?
The brake light switch is a mechanical switch located under the dashboard, mounted to a bracket near the brake pedal arm. It is activated by the movement of the pedal itself.
Can I repair my original brake light switch?
These switches are generally not designed to be repaired. They are sealed units, and given the low cost of a new replacement and the critical safety function it performs, replacing a faulty switch is always the best option.
Are there any recalls for the 1935 Oldsmobile L-35 brake light switch?
No. The National Highway Traffic Safety Administration (NHTSA), which manages vehicle recalls, was not established until decades after this vehicle was built. There are no official recalls for this model.
What should I check before replacing the switch?
Always check the simple things first: ensure the brake light bulbs are good, check the fuse for the brake light circuit, and look for any broken or disconnected wires.
Technical Specifications
Mechanical, 2-Terminal, Plunger-Activated Switch
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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.