If the brake caliper locks up and you know it was working fine, a lot of times the inside of the hose collapses and the fluid will not retract and release the caliper. The rubber hose to the caliper. God-Bless!
Ok. I am not sure what you are meaning by "did not return fluid from caliper" but if you are trying to bleed out the caliper,make sure you have enough fluid in the brake fluid resevoir under the hood.And then have someone pump the brakes 5 or 6 times,then hold the pedal down.With the pedal held down,loosen the bleeder screw on the caliper.The brake pedal should go down to the floor.Tighten the screw then let the brake pedal up. Do this until you have a steady squirt of brake fluid come out of the bleeder screw when you push the brake pedal down and loosen the screw.If you keep doing it and no fluid is coming out,then you either have too much air still in the line,not enough fluid in the system, or you have a blockage in the line.Make sure you bleed the brakes at all 4 wheels.Good luck
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