1996 Eldorado shuts off while driving when brakes are pressed.

Does the vehicle start after sitting over night or do you need to jump start it . Is the charge light on ( batt. symbol ) at any time ? Serpentine belt good , tensioner good ? Battery cable connections good an tight and no corrosion ? Battery also good ? That is normal for battery voltage to jump up to 14 volts after starting , alternator is replenishing the battery after starting ,that draws down the battery . Going down to 11 or 12 volts when stopping and almost stalling isn't a charging system problem . You have a idle problem , IAC - idle air control valve or dirty air passage , a vacuum leak . Giving it gas and it going up to 13+ the alternator is working . Your best bet take it to a qualified repair shop and have it check .

it is an abs relay

Usually means the vac motor is faulty, or you have lost vac to the motor. When you shift out of park, vac pulls the release for the parking brake.

The brake release is vacuum operated. Check to see if a hose broke or maybe just fell off.

I'm assuming there is a sensor attached to the emergency brake pedal. Try driving the car with those sensor wires shorted together.

AS programs can be altered I would have it checked out at a dealer service centre as they will need the keys and the vehicle to see if it can be done

On this website you find fuse box diagram and description for Cadillac Eldorado (1996)


https://www.carknowledge.info/cadillac-eldorado-1996-fuse-box-diagram

It is a vacuum issue. Let up on the gas will up the engine vacuum and that should help.

you have 4 o2 sensors on the new one 2 in front of catylitic converter and 2 after on the exhaust

shot in the dark but you may want to check your shocks