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Release and set the brake repeatedly in an attempt to help dislodge any ice from the brake system. Shovel snow or arrange other material along the sides of the vehicle. Doing this will create a path for air flow from front to rear of the vehicle, minimizing "losses" from under the vehicle's sides. The objective is to get the heat created by the engine and circulated to the radiator at the front of the vehicle, to the rear of the vehicle where most of the parking brake components are located (adjust for locations that differ from those offered in this article). Creating a "channel" under the vehicle by piling snow, etc. in the space under the sides of the vehicle accomplishes just that. If ice is preventing the release of your parking brake, warming up the car can help melt the ice and free the brake. Start the car and leave it running for at least 10 minutes before attempting to release the parking brake. Wait outside the vehicle while it is running. Once the engine has warmed, the heated air pulled through the radiator by the fan and heat created by the exhaust system will pass under the length of the vehicle. The more effort used to "seal" the open spaces under the sides of the vehicle, ensures that the warm air passes under its entire length and allows the thaw process to complete in the least amount of time.
Start the car first. Block as much of the open space between the ground and sides of the vehicle if the brake is still frozen. Allow the car to warm up.