i had a problem after i changed my rear brakes where they were fine right away but then they locked up tight. It turned out that those sliders from the calipers to the carriers didn't slide. but that doesn't sound like your problem. probably m/c.
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had this same problem the other day my little gay brother mixed steering fluid with my break fluid go get it fixed asap or else have to pay of a whole new braking system check the master cylinder cap if it inflated you have something other that break fluid.
well a lot could happen when your brakes lock up. Depending on how far it was driven and how hot it got. Superheating can lead to Warped rotors. Collapsed Brake lines, Ruin the Calipers. You wont know for sure until you flush your brake system to start.