What would cause the front brake to lock up other then the caliper

SOURCE: 2004 Saturn VUE AWD V6 has a harsh grinding sound in front wheels

Have you checked your wheel bearings? When these go out you can get a harsh grinding noise. This sounds like that is what it might be. Does it happen when you are going fast/slow turning/going straight? I know you said it's inconsistent but the more info the better. However, if I had to bet, based on what you have already said, it's your wheel bearings. Let me know if you have further questions. Thanks for using FixYa!

SOURCE: After replacing drive side caliper, both front

I assume you mean that you replaced the front pads and rear shoes. Or did you also replace the disks and drums?? Either way you should be ok unless you also replaced the slave cylinders on the rears.
The fluid flows back up to the Master Cylinder as you squeeze the calipers and the slaves to fit the new parts in. Some people pre-fill the caliper to reduce the amount of air and make bleeding easier.Now .....Grinding better be a wrong choice of words. Possibly you spilled fluid on the pads while bleeding the lines. This will cause a binding and shuddering when you apply brake pressure. This will also make you think the lines are not bled properly because of the increased pedal pressure you are putting on the wet/lubricated front pads. If so, replace the pads. Don't try washing them with aerosol cleaner cause it takes more time and money than simply changing them.

SOURCE: we replaced brakes, calipers, master

there are flat compression washers used to connect the flex hoses to the wheel cylinders. the only situation i have seen which mirrors yours is where those washers are not replaced prior to bleeding. i am assuming you are bleeding it correctly.

SOURCE: My 1997 Saturn SL-2 is having a brake lock

replace brake hoses they are braking down on the inside

SOURCE: brakes are pulsating in pedal.

Your rear drums are out of round (warped). Eventhough you turned them the problem will not go away because they have hot spots in them that turning can't remove. You need to replace them with new ones to solve this problem. Pulsing pedal is rear brakes and a shimmy in the steering wheel while braking is in the front brakes.. Good luck I hope this helps you out.