Door sags 1996 buick

Have you checked the hinges to see if one is worn out ?

It is your e-brake cable. e-brakes are mechanical, not hydraulic, therefore it has nothing to do with your master cylinder. adjust the cable at the e-brake itself or re-hang the cable to its rightful resting place.

This same thing happened to me in my 1996 buick century just a few days ago. I have the same problem with the door locks and the radio resetting to AM too. I also have the problem of the seats not moving. I think it might be the curcuit breaker or a fusible link. I am not a mechanic, but I do have the repair manual and the mechanics book with the wiring diagrams. If you want me to send the wiring diagram I could do that. I hope that helps. Let me know what you find cause I got the same problem.

Probably your hinge pins and bushings are worn out.Most parts stores sell hinge pin kits and the door spring compressor for removal of the door spring.You may also need some help door is heavier than you might think.

the bushing itself is not replaceable. you have to replace the whole bolt. the new one comes with the bushing on it. a ratchet and torx bit is required to do this takes like 5 min to do. just unscrew the old one and insert the new one. you may have to kinda move it around before you tighten it to allign it. also make sure your door insnt sagging and causing the door to bind on the striker bolt. hinge pins in your door being bad can cause this

COS THEY ARE TOO BLOODY HEAVY...use a lump of 3x3 to lift the rear of the door to "adjust" the door back to its normal level)

You have to remove the hinges from the pillar post.
This will completly remove the door.
After removing door re-install new hinges
repeat the process in reverse

replace the hinge

get an alignment check. Most likely the rear is sagging and will need new springs. Replace the front ones also.

If you have air suspension then its going to take more hands on diagnosing to figure it out.

Reading between the lines I think you are saying the handle works fine to disengage the latch but the door itself does not want to open like it is binding in the opening. If so check the door hinge pins. They can wear and then the door can sag in the opening and be hard to open. You should likewise have a small problem with closing the door if it is the hinge pins.