Pull your brake shoes on that wheel......rotate the disc by hand to assure that the "Parking Brake" is free......

take a large screwdriver and pry the caliper pistons back into the caliper.....this might free them up enough to drive the car......

If the pistons will not move into the caliper, try cracking the brake bleed screw.....and pry.....if the caliper piston moves and fluid squirts from the bleed screw.....you have a blocked brake line......

sometimes a bit of the rubber inside the hose can form sort of a check valve....and prevent the fluid from returning to the reservoir....

Caliper overhaul kits are relatively cheap, and easy to install......

SB

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Diesels:
'85 300D, "Max, Blue Benz", 155K, 27.0 MPG
'84 190D 2.2, "Eva, Brown Benz", 142K, 40.2 MPG
'77 240D (parts car)
'67 Eicher ES 202 Tractor "Otto" (2cyl, Air Cooled, 30HP)
Gassers:
'94 Ford F-150, "Henry", 170K (300 Six) 17.5 MPG
'85 190E 2.3, 148K....Parts Car
'58 Dodge W300M Powerwagon (Flat Fenders) Less than 10 MPG