99 ram 3500 front brakes sticking, Replaced the front flex lines. Calipers don't seem to be sticking as I can push them back with a C clamp. I drove the truck after I replaced the hoses and it seemed fine. After it was parked for a couple of hours they were stuck again.

When you replaced the calipers, did you also replace the caliper frame and slides? Start there. It is common in ford disk brakes to get "stuck" slide pins as they can rust inside the caliper causing the brakes to fail to release the rotor when you let off the pedal. Another cause is the flex line that connects the caliper to the metal lines at the body. As it ages, the inside of the rubber breaks down and collapses effectively becoming a check valve. Pedal force pushes fluid to the brake but separator spring pressure is not enough to make the fluid go back into the master cylinder effectively making the brakes lock up and bind. Try replacing slide pins if haven't already and replace the flex line.

Replace all the rubber flex hoses going
to the calipers

They have collapsed inside

Sometimes the rubber brake lines that flex and go to the calipers can break down inside and start to deteriate and they can act like a check valve, they will let fluid through one way but not the other way, if you havent replaced them i would suggest trying that

are you talking about both front brakes sticking.by lines i assume you mean the brake flex hoses.have you checked to make sure that the sliding surfaces are smooth and free of damaged surfaces and the brake pad clips are in the proper places.if so and all this is good that you have done then you could have a master cylinder that is not releasing pressure for the front brakes,or you could have a defective flex hose(if they are not twisted) that is blocking the fluid from releasing the calipers.

Chances are the calipers are sticking, you can check this by taking a suitable tool and prying the pistons back into the housings [ careful not to damage the surface of the rotor ]. If the calipers are bad you won't be able to and will need to be replaced. Another cause could be the flex hoses, sometimes they will seperate inside and let the fluid flow only one way locking the calipers. You can check this by opening the bleeder screw on the caliper and see if it loosens it's grip rotating the wheel.
Note: the pistons in the calipers should only back-off enough to let the wheel to rotate with a very slight drag.

air in system push break down look for bleeder on check valve if not break line loose at check valve retighten . pump break don t fix push pedal loosen another line tighten back check again

If the calipers have two,or four notches in the piston of the calipers,then the pistons have to be turned in,one side turns left,and the other right,then they will go back,the auto parts store sells a cheap tool for this,that you use a 3/8 drive ratchet with,if this was helpful,please rate,and thank you

Assuming all calipers, pins etc have been lubricated and checked properly, I wouldn't rule out the flex hoses at the calipers. They have been known to deteriorate internally and cause flow problems, which would restrict back flow on release of pedal.

If your brake job was a professional job, return your vehicle for adjustment. They should have serviced the calipers as a part of the repair. If you told them to NOT service the calipers to save the couple bucks ... well now you will have to pay it.

Please get this repaired before there is a serious problem.

thank you

there is air there somewhere. try manual bleeding the brakes. do the farthest wheel first. if they are calipers all the way around, when you bleed them tap them gently to remove any air that can still be inside the chambers.

robert