The “brake failure” warning light on your MGB dashboard is a critical safety indicator. This light, often accompanied by a “lamp brake failure” message, signals a potential problem within the braking system. Ignoring this warning could lead to reduced braking performance and increase the risk of an accident. This article provides a comprehensive guide to understanding and troubleshooting the MGB lamp brake failure warning.
Understanding the MGB Lamp Brake Failure Warning
Unlike modern cars with sophisticated electronic brake systems, the MGB relies on a simpler hydraulic system. The lamp brake failure warning light typically indicates one of two issues:
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Low Brake Fluid Level: This is the most common cause. The brake fluid reservoir located under the hood should have a “MIN” and “MAX” mark. If the fluid level is below the “MIN” mark, the warning light will illuminate.
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Brake Light Malfunction: The warning light circuit is often integrated with the brake light circuit. A faulty brake light bulb, blown fuse, or wiring issue can trigger the warning light.
MGB Brake Fluid Reservoir
Troubleshooting the MGB Lamp Brake Failure Warning
Before attempting any repairs, park your MGB on a level surface and engage the parking brake.
1. Check the Brake Fluid Level:
- Open the hood and locate the brake fluid reservoir.
- Check the fluid level against the markings on the reservoir.
- If the fluid level is low, add the correct type of brake fluid (DOT 3 or DOT 4 as recommended by the manufacturer) until it reaches the “MAX” mark.
2. Inspect the Brake Lights:
- Have a friend press the brake pedal while you check all brake lights (left, right, and center).
- Replace any burnt-out bulbs immediately.
- If all bulbs appear to be working, inspect the brake light wiring harness for any damage, loose connections, or corrosion.
MGB Brake Light Wiring
3. Check the Brake Light Switch:
- The brake light switch is located under the dashboard, typically near the brake pedal arm.
- This switch activates the brake lights when the pedal is depressed.
- Inspect the switch for any signs of damage or misalignment. If necessary, replace the switch with a new one.
4. Inspect the Brake System for Leaks:
- Carefully examine the brake lines, calipers, and wheel cylinders for any signs of fluid leaks.
- Leaks will appear as wet spots or drips around these components.
- Any detected leaks require immediate attention from a qualified mechanic.
When to Seek Professional Help
While the steps above can help diagnose common issues, it’s crucial to seek professional help if:
- You are uncomfortable working on your car’s braking system.
- The brake fluid level remains low after adding fluid, indicating a potential leak.
- The warning light persists even after addressing the common causes.
- You experience any unusual braking behavior, such as a spongy brake pedal, grinding noises, or pulling to one side.
Conclusion
The “mgb lamp brake failure warning” light should never be ignored. Promptly addressing this warning can prevent further damage to your MGB’s braking system and, most importantly, ensure your safety on the road. Remember, when it comes to brakes, it’s always better to err on the side of caution and consult a qualified mechanic if you have any doubts or concerns.
