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I have 1970 chevelle SS I am currently putting back together. When I push the brake pedal down the idiot light to the left of the steering column turns on. I know the light on the right is the brights and I believe the lights on the left is emergency brakes. Can someone verify this and let me know why the light turns on when the brake is depressed.
 

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Open the hood. On the driver's side, near the brake booster there's a tan wire that runs down to the frame. It attaches to the brake distribution block that the brakes lines go to.
Disconnect that wire.
Press on the brake pedal.
Does that unidentified light (guessing e-brake light)remain off?
Post back with the answer. If it does, you have a problem.
 

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I wouldn't guess that there's a problem with the warning switch. It sounds like it's doing what it's supposed to. That is, every time you push on the the pedel, it is rocking the switch on and off and making the light go on and off. So the switch isn't stuck. That much I can see.
Almost sounds like the front or rear brakes have little or no fluid allowing the warning switch to toggle. Perhaps a leak. That's my guess.
If these are power brakes, the pedal will feel hard if the car isn't running, so a hard pedal doesn't mean much.
Anyway, sounds like something to look into before moving the car.
 
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