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Hello. My name is ***** ***** I will be assisting you today. Have you tried checking the connection to the brake actuator on the rear wheels. I've come across a couple of VWs with this issue and it turned out that if these connectors aren't functioning, the vehicle senses something wrong and the park brake engages to prevent the vehicle being driven without brakes. You can remove them rear wheels and on the back side of the caliper you will see this plug. Test this plug for power and ground and also, make sure it's connected(on both sides).