Its locked-up you need to go behind the backing plate and go thru the inspection hole to contract the brake adjuster-you best bet is to remove the drum and inspect it-
August, 5, 2011 AT 9:42 PM
The metallic brake linings have rusted to the brake drum from humidity in the air. You'll have to just keep working it back and forth until it releases. Pump the brake pedal while trying to move slowly on blacktop or concrete, not on dirt or gravel.