How can I tell if my break line is broken?? on 1991 Buick Riviera

I stopped kind of hard and heard a loud pop and right away my break pedal went to the floor. it will still stop but it goes all the way down??? What should I do?

Asked by for the 1991 Buick Riviera
or possibly a brake caliper over extended inself. look for a large amount of fluid.
1 more answer
If your brake line broke somewhere you will find brake fluid pouring out somewhere. Suspect this may be the master cylinder that gave out.
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