BMW 325i Brake Light Switch Guide for 1987-1991 Models
Solve brake light and cruise control problems on your E30 with the right replacement switch.
- A bad brake light switch can cause your brake lights to fail or stick on, and will disable your cruise control.
- This is a simple, low-cost DIY replacement that most owners can complete in under an hour.
- For this model, you need a 2-pin switch; ensure the pedal is adjusted correctly if problems persist after replacement.
- Driving with a non-functional brake light switch is a major safety risk and should be addressed immediately.
Is Your BMW 325i Brake Light Switch Failing?
A failing brake light switch on the E30 3-Series is a common issue. The symptoms are usually straightforward, making it easy to diagnose. Because this part is linked to both the brake lights and cruise control, a failure can show up in a couple of different ways.
Common Failure Symptoms:
- Brake Lights Don't Work: The most serious symptom is when your brake lights fail to illuminate when you press the pedal.
- Brake Lights Stay On: The switch can also fail in the 'on' position, causing your brake lights to remain on constantly, draining your battery and confusing other drivers.
- Cruise Control Inoperable: If the switch is faulty, it may prevent you from setting the cruise control or cause it to cancel unexpectedly.
- "BRAKE LIGHT" Check Control Warning: Your car's onboard check control panel may display a warning message, though this system doesn't always catch a switch failure.
Choosing the Right Aftermarket Brake Light Switch
For the 1987-1991 325i, you need a 2-pin switch. While a Genuine BMW switch is available, several aftermarket brands offer a good balance of quality and value. Here’s a breakdown of what to expect.
| Brand Tier | Brands | What to Expect |
|---|---|---|
| OEM / Premium Aftermarket | Hella, Vemo | These brands often serve as Original Equipment Suppliers (OES) to German automakers. They are engineered to meet or exceed original specifications. While Hella is a well-known OEM, Vemo is also marketed as a premium quality brand. Choosing from this tier is the safest bet for long-term reliability. |
| Standard Aftermarket | Facet, Standard Ignition | These are reliable mid-tier brands that offer a good combination of price and performance. Facet is a widely available option for this part. They are a solid choice for daily drivers and DIY repairs where budget is a consideration. |
| Economy Aftermarket | URO Parts | Economy brands provide the most budget-friendly option. For a simple switch like this, they can be a viable solution, but may not have the same lifespan or precise fit as higher-end alternatives. They are best for quick fixes or cars that see limited use. |
Cost of Replacing a 1987-1991 BMW 325i Brake Light Switch
The cost to replace the brake light switch is relatively low, especially if you do the work yourself. The part itself is inexpensive, and labor is minimal.
| Item | Estimated Cost |
|---|---|
| New Aftermarket Part | $18.96 - $34.75 |
| New OEM Part | $70 - $80 |
| Shop Labor | $50 - $180 |
DIY Installation Tips
Replacing this switch is a great DIY task that takes less than an hour. The switch is located above the brake pedal. You will need to remove the driver's side lower dash panel for access. The switch is held in its bracket by plastic tabs. It can be tricky to release them in the tight space, and some owners find it easier to simply break the old switch to remove it, since it's being replaced anyway. Before installing the new switch, make sure its plunger is fully extended.
Frequently Asked Questions (FAQ)
Is it safe to drive with a bad brake light switch?
No. If your brake lights are not working, other drivers won't know you are stopping, which is a critical safety hazard that can easily lead to a rear-end collision. If your brake lights are stuck on, it can confuse other drivers and drain your battery. This part should be replaced immediately.
Why did my cruise control stop working but my brake lights are fine?
The brake light switch sends signals to both the brake lights and the cruise control module. It's possible for the switch to fail in a way that it only affects the cruise control circuit. This is a common early symptom of a failing switch.
Do I need to adjust the new brake light switch?
For the 1987-1991 E30, the switch itself is not adjustable. It simply clips into the bracket. If your brake lights are still on after installation, the issue is likely the brake pedal's resting position. You may need to adjust the pedal's pushrod to ensure it fully depresses the switch's plunger when your foot is off the brake.
Are there any recalls for the E30 brake light switch?
Yes, there was a recall issued for the 1987 BMW 325 (NHTSA Campaign ID 86V151000) related to the brake light switch. However, given the age of the vehicle, it is highly unlikely that any car has an outstanding open recall for this issue. Failures today are due to the age and wear of the part.
Technical Specifications
OEM Part Numbers: 61318360420 61311382385
Connector: 2-Pin, Type: Plunger
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.
- BMW 325i: