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Your '77 doesn't have a proportioning valve unless it was installed by a previous owner. It didn't come from the factory with one. The thing many people mistakenly call a proportioning valve is actually something else altogether.

It's actually a PRESSURE DIFFERENTIAL SWITCH. It just detects the pressures in the front and rear brake systems and, if one is leaky or has lower pressure than the other, it will trip and illuminate the BRAKE light.

To "reset" it, all you have to do is troubleshoot your brake system to find out whether it's the fronts or the rears that have low pressure. I'd start by inspecting all of them for leaks. That's the most common thing. Fix that and the PRESSURE DIFFERENTIAL SWITCH will reset itself the first time you use the brakes after a successful repair.

Good luck.

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14y ago
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Q: How do you reset the proportioning valve on a 1977 corvette?
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