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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.
What else can I help you with?
What is a 1977 Corvette?
A Corvette that was built in late 1976 up to late 1977.
How do you install seat covers on a 1977 Corvette?
what is the process for installing new seat covers in a 1977 chevrolet corvette
How do you install power window switches for a 1977 Corvette?
How do I replace the power window switch on 1977 Corvette coupe
What is the spark plug gap for a 1977 Corvette?
Spark plug gap for a 1977 Corvette using ACDelco R45TS is .035
Do you have a diagram of a 1977 corvette horn assembly?
You can find a diagram of a 1977 Corvette horn assembly at your local library. Look in the car repair section for a Corvette repair book.
Is 1977 Corvette a stingray?
No, the last year for the Corvette to be called a Stingray was in 1976.
Will the door panels off a 1976 Corvette fit a 1977 Corvette?
Yes.
How do you repair a window on a 1977 Chevy Corvette?
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How do you remove door panel from a 1977 corvette?
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Can a 1978 Corvette headlight fit on 1977 Corvette?
Yes, the headlights should be completely identical.
How much did a Corvette cost in 1977?
I think $8500
What Oil type is used for a 1977 corvette?
15W40
