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I am having a brake issue in My 82 GMC van. when I press on the brake, normally it will be firm, other times it will start firm, then go to floor slowly, setting the brake light. when this occurs, I press down hard, and light goes out. do I have something to worry about????
 

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I'm not liking the sound of that Jeff. Have you checked top to bottom for leaks in hydralics? Resevior to bleeder screws.
 

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Air in the lines,

Leak in the lines,

Leaking master cylinder,

All dangerous and should be corrected immediately.

Look for wet spots near any brake part, lines.

Then fix.
 
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