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Parking Brake wont release

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I am not sure if your's works with vacuum but if it does there is a tiny vacuum servo motor. The diaphram in that motor goes bad an no longer pulls the release. You can test this motor with a handheld vacuum pump and a length of hose. Hell you might even be able to test it with a short length of hose and creating a vacuum by sucking on it.... If there is no resistance with you suck the vacuum the diaphram is damaged.

Here is a photo of the parking brake assembly from my 91. The vacuum motor is #7. Its pretty easy to replace if it is bad, I am not 100% sure that yours is identical but have a look at it


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