Saab 900 Brake Light Switch Guide: Symptoms, Replacement, and Part Selection (1979-1997)
Solve common brake light and cruise control problems on your Classic or NG900 with the right replacement switch.
- A bad switch can cause brake lights to fail, stay on, or disable cruise control.
- Verify if you have a Classic (c900) or New Generation (NG900) model before buying, as the parts are different.
- Choose a quality aftermarket brand like Hella or Vemo; avoid budget brands known for poor quality like Professional Parts Sweden.
- This is a simple, low-cost DIY repair that takes less than an hour for most owners.
Is Your Saab 900 Brake Light Switch Failing?
A faulty brake light switch is a common issue on the Saab 900 that can create serious safety risks. Because the symptoms can be misleading, it's important to know what to look for. Often, the first sign isn't the brake lights themselves, but a cruise control system that refuses to engage.
Symptoms of a Bad Brake Light Switch
- Brake Lights Don't Work: The most obvious and dangerous symptom. After checking the bulbs and fuse #12, 🎬 Watch this video to troubleshoot other rear lamp electrical issues. the switch is the next likely culprit.
- Brake Lights Stay On: The switch can fail in the 'on' position, leaving your brake lights illuminated even when the car is off. This will drain your battery.
- Cruise Control Inoperative: The switch is designed to cancel the cruise control when you brake. If the switch is faulty, it may prevent the cruise control from setting at all.
- Intermittent Brake Lights: Worn internal contacts can cause the lights to flicker or work only some of the time.
Choosing the Right Aftermarket Switch: Classic vs. NG900
The most common mistake when ordering this part is getting the wrong one. The 1979-1997 year range covers two distinct generations: the Classic 900 (c900, 1979-1993) and the New Generation 900 (NG900, 1994-1997). These use different switches.
- Classic 900 (c900): Typically uses a threaded-body switch with one or two nuts for adjustment.
- New Generation 900 (NG900): Often uses a switch that twists and locks into the pedal bracket without adjustment nuts.
Pro Tip: Before ordering, look at the switch on your car's brake pedal. Note whether it is threaded with nuts or has a twist-lock design. Comparing the new part photo to your old part is the best way to ensure you get the correct one.
Aftermarket Brand Quality
For a simple part like a switch, you don't necessarily need an expensive OEM part, but quality still matters. Based on owner feedback, aftermarket brands fall into a few tiers.
- Premium Aftermarket (Recommended): Brands like Hella are often original equipment suppliers to German and Swedish automakers and have a strong reputation for quality and fit. This is a safe and reliable choice.
- Standard Aftermarket: Brands like Vemo, Facet, and Standard Ignition are generally considered acceptable mid-tier options. They offer a balance of good price and reasonable quality for most owners.
- Economy / Budget (Use with Caution): Professional Parts Sweden (PPS) has a poor reputation among Saab and Volvo owners for high failure rates and parts arriving dead-on-arrival. It is best to avoid this brand unless no other option is available.
Replacement Cost
Replacing the brake light switch is an inexpensive repair, whether you do it yourself or take it to a shop.
| Item | Estimated Cost |
|---|---|
| Aftermarket Brake Light Switch | $5 - $40 |
| Shop Labor | $60 - $90 |
| Total Professional Replacement | $65 - $130 |
Frequently Asked Questions
Can I replace the Saab 900 brake light switch myself?
Yes, this is a very DIY-friendly job. It requires basic hand tools and working in the driver's footwell. The process involves removing the lower dash panel, unplugging the electrical connector, and unscrewing or twisting out the old switch. The entire job usually takes less than an hour.
🎬 Watch this walkthrough to see how to replace the switch.Does the new switch need to be adjusted?
Yes, adjustment is critical for proper function. The switch should be positioned so the brake lights activate as soon as you begin to press the pedal, typically within the first 10mm of pedal travel. 🎬 See this video for a guide on adjusting your switch. If adjusted too loosely, your lights will come on late. If too tight, they may not turn off at all.
My brake lights are stuck on. Is it always the switch?
Most of the time, yes. A switch that is misadjusted, internally failed, or gummed up will cause the lights to stay on. On some cars, a small plastic stopper on the brake pedal arm can break off, preventing the pedal from pressing the switch plunger. While not a widely reported Saab issue, check for small plastic bits on your floor mat.
Are there any recalls for the Saab 900 brake light switch?
No, there are no specific NHTSA recalls or Technical Service Bulletins (TSBs) for the brake light switch on the 1979-1997 Saab 900.
Helpful Videos
Technical Specifications
OEM Part Numbers: 8548802 8577702 7334642 32018007 9505462
Located on the brake pedal assembly. Operation is mechanical via a plunger. Designs vary between a threaded body with adjustment nuts (Classic 900) and a twist-lock style (NG900).
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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.