All 4 brakeswontrelease

After applying brakes is it all four brakes,check portion valve.if it one check the braided brake line they go bad inside looks fine on outside ,to check jac up the locking brake side have a helper apply the brakes the release spin the wheel if it doesn't release loose bleeder check if it has fluid flow if it releases then replace braided line.

Replace the caliper on the wheel that drags on the brake pads. It is not releasing correctly.

I assume they are disc brakes your having the problem with.It is more than likely the disc brake calipers,or brake hoses.when the brake caliper locks down and wont release,brake the bleeder screw loose on the brake caliper,if the brake caliper releases then the problem will be the brake hose.If the brake caliper does not release,then it is the brake caliper that is the problem.

Which wheel(s) are not releasing? Could be debris in the wheel cylinder(s) partially blocking the return fluid (drum brakes) or a defective wheel cylinder or cylinders or even defective calipers (disc brakes).

Try this:

check the brake bracket ,if you use wrong bracket and check the brake caliper casing .

I would think it is something going on with the master cylinder or booster. Even the ABS could be affecting it.

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.

has to be a colapsed hose.
try loosening at line to hose connection,
then loosen at caliper to hose,
if it releases at line to hose the problem is before, but most likely it wont untill you release at caliper if so replace hose

If the car has sat for a long period of time the calipers can be seized and not allowing brakes to release properly. If they are siezed it's best to have them replaced.