2001 dodge diesel 2500 front brakes locked up. Checked all brake lines,bleed the brakes and they wont release.

Try bleeding the brakes. But, it sounds like you have a fluid leak. Check all four wheels for brake fluid leaking.
Check frame for wet spots.
chcke that the Master Cylinder is full.

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Master cylinter is shot is my first thought. if it has been replaced with a referb.. replace it again. make sure you bench bleed the master cylinder before putting it on.. if it's new, you have a ton of air in the lines.. bleed the pass rear first/ drivers rear/ pass front/ pass rear.. FYI your brakes/ tires should never lock up, you have ABS.

if you talking brakes not clutch. you can pump the brakes all day long and they don't build pressure and you not losing fluids the master is out. now if you pump them up and they are rock hard your hydrabooster is out.now if your mechanically incline you can order a master cylinder rebuild kit for like 20-30 bucks which is basically orings from local parts store and only tools you need are snapring pliers. or you can change the master ,bench bleed it first then bleed out the rr,lr,rf,lf in that order.hope i help.all under 100 bucks

It sounds like you have a bad mastercylinder cause when you panic brake it doesn't have time to bleed through the valve in the cylinder but under normal braking your foot is on pedal longer in turn giving the fluid time to bypass the valve in the mastercylinder in turn the pedal going to the floor.

I worked on a Dodge car one time and I had a problem with the brakes almost similiar to yours.It turns out a cheap pair of brake pads can mess up your system. I would suggest Bendix pads I also noticed you didn't mention the rear shoes. Any way use better pads it might help.

does the clutch cylinder use the same fluid resevoir ar the brake ?? if it does it might just need bleeding because when you done the brakes the fluid level dropped

Sounds like a short in your wiring. Have you checked the bulbs and you could have bought a bad brake light switch. Try having somone step on the brake lights and use a test light to see if your getting current back there

is it the front or rear locking up? you really have to have this truck loaded (load valve under bed) before the back brakes come on and i think these are the same as my 1999 2500 where the rear is only abs, and not on the front..dumb design i know, but thats how it is...determining if its rear abs only and which axle is locking up will help pin point the problem...i put 100000 miles on my dodge since i got it in 2001 and i put 8 sets of pads on the front and just changed the rear lining and thats only because the rear wheel cylinder was leaking causing the rear brakes to lock up..

Was the leading input shaft adjusted correctly? Usually they come with a new one and has to be matched in length to your old one. If the old one was used I would bleed the system from the right rear, left rear, right front, & left front in that order. Always bleed from the furthest point first. Sometimes air in the lines will lock these up

Sounds like it was pulling before the brake job...if so the only thing you didn't replace was the rotors, I assume you turned them? and did you see hard spots on the rotor? discolored area that didn't cut the same......switch the rotors left to right and see if the problem moves or just replace them if they've been cut twice.