DOT 5 brake fluid is a stand alone fluid, not compatible with some types of rubber in brake systems. If your car was newer and had ABS, yes, most of the system would be ruined because the ABS unit has lots of tiny seals you can't get to that would swell up and get stuck. Without ABS, flush the system with DOT 3,4 or 5.1. Those 3 fluids are all glycol based and compatible. DOT 5 fluid, silicone based, used in a system not designed for it, will cause problems of swollen seals and hoses. Hopefully, you caught it in time and can get it out, or possibly your new brake components are compatible with DOT 5. One way to know would be to take the MC cover rubber seal and soak it in DOT 5. If it's not compatible, it will swell overnight to 1.5-2 times it's normal size. Then you will know.
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