brakes

If you have to release brake fluid pressure, has the master cylinder been replaced. Fluid is not returning to the master cylinder reservoir I wonder if the push rod clearance is lacking, Acura and Honda have a adjustment procedure and a gauge tool to use to ensure the brake booster push rod where the push rod comes in contact with the rear piston of the master cylinder are set correctly. You say the problem is definitly one the one front caliper? Would lo love to here what you find.