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If your brake hose collapsed internally that will cause brakes to lock to be sure its the hose and not the calipers open the bleed screw and see if the rotor release. If they stay locked then maybe calipers seized try to pry brake pads apart with caliper mounted and brake bleeder open if they return easy then change your brake hose.
More often then not, the calipers don't sieze up, the rubber brake hose locks pressure inside the caliper. Try pushing the caliper piston back in, then do the same with the bleeder open. If they go in hard with the bleeder closed, and easy with the bleeder open, replace the corresponding brake hose.
To check this problem. raise the front when they are locking up. open the bleeder valve on the caliper. If the calipers release then replace the hose going to the caliper. if they don't release replace the caliper.
most common cause would be a bad disk brake caliper, or bad brake hose.
the way to find out witch one, is to jack up the front of the car and put it on jack stands. put the transmission in neutral. then turn the front wheels one at a time and wile turning the wheel have some one apply the brake the wheel should stop turning immediately and then wileapplying pressure on the wheel have the person in the car release the brake pedal the brake should release immediately if not, then open the brake bleeder on the offending caliper if the brake releases then. you have a bad brake hose if the brake still does not release with the bleeder open then you have a bad brake caliper.
this could be caused by a few things, first you need to jack the truck up you will need all 4 wheels off the ground, put the transmission in neutral and have some one get in the truck and wile turning each wheel have the person in the truck push the brake pedal the wheel should stop instantly then have the person release the brake the brake should release instantly,( do this to each wheel ) if all brakes remain locked ( wont release instantly ) then replace the master cylinder if the both rear brakes wont release instantly replace the brake hose from the frame to the rear differential, if the both front brakes wont release replace master cylinder, if only one front brake wont release open the bleeder on that brake caliper if the wheel releases replace the caliper hose if the brake still wont release with the bleeder open replace the caliper, you should replace the caliper and brake hoses as a pair.
The caliper ,or the caliper brake hose is bad,get it to lock up,then open the bleed valve on the caliper,if the caliper turns loose of the rotor,then the hose is bad,if it does not turn loose the caliper is the part to replace.
Check the caliper ,and the caliper brake hose,if the caliper will lock down,and not release,loosen the bleeder screw on the caliper,if the caliper releases,the brake hose is bad,if it does not release the caliper is bad.
Jack it up and remove the wheel. Push the brake and release it. The calipers should release. If they don't, open the bleeder. If the caliper releases as soon as you open the bleeder, replace the brake hose. If the caliper doesn't release when you open the bleeder, replace the caliper.