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Check the operation and alignment of the brake light switch, located at the upper end of the brake pedal under the dash area

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Q: How do you turn off brake light on 1978 Ford F150 4x4 pickup truck?
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Make sure brake fluid in the master cylinder is at the proper level Make sure parking brake is fully released and switch is working


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Either the power brake booster is bad, or it don't have any vacuum going to it. That is the part that the brake master cylinder is bolted to.


Do you have the fuse box diagram setup for 1978 gmc pickup?

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Why isn't the brake lights not working on a 1978 ford pick up truck?

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