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Emergency brake light flashing on and off 90 Chevy pickup?

Here are a few possible causes for your 1990 Chevy's emergency brake light flashing on and off:

* Low brake fluid: Check the brake fluid level in the reservoir under the hood. If it is low, add more brake fluid and check for leaks in the brake lines.

* Faulty brake light switch: The brake light switch is located on the brake pedal assembly. If it is faulty, it can cause the emergency brake light to flash on and off.

* Electrical problems: There may be a loose or damaged wire somewhere in the electrical circuit that controls the emergency brake light.

* Faulty emergency brake light assembly: The emergency brake light assembly itself could be faulty, causing the light to flash on and off.

To troubleshoot the problem:

1. Check the brake fluid level.

2. Inspect the brake light switch for damage or wear.

3. Test the continuity of the electrical circuit that controls the emergency brake light.

4. Replace the emergency brake light assembly if it is faulty.