my 2002jeep liberty locked up when i was backing up now it wont move unless you put it in4 high even then you better hang on what is wrong with it.
Sounds like the parking brake locked up on you. Try pulling up and down on the parking brake to free it, if not, you will need to remove the rear wheels and use some muscle to free it up and replace the rusted parts or cables. Better yet, take it to a brake shop ASAP.
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