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disconnect the front and rear brake lines, undo bolts holding the master cylinder to the brake booster. Bench bleed the new master and reconnect to booster and reconnect lines. Be very careful when undoing the lines from the master cyclinder as you do not want to damage them. Soak with WD-40 before loosening. Once everything is back in place you will need to bleed all calipers and/or wheel cylinders. Again soak the bleeder screws beforehand with WD-40 as they break off easily.
In the rear you have an abs hcu you can throw way
& bypass,then unplug the controller up under the dash
on the passenger side
Also the rear brake cables won't work for rust,they have to go also
I had a 1992 Dakota for 18 years
Leave the wire off the proportioning valve as the vehicle is wired wrong & if your bleeding it ,it will melt down the wires in the ignition switch (been there) Vehicle is not the same as the factory wiring diagrams
You 're brake master cylender has failed.
How to change it.
Use a flare wrench and remove the two brake lines. Then remove the the two nuts that hold it to the fire wall. Then remove. Then remove the master cylinder reservoir because your going to have to put it on the new one. Drain out any brake fluid from it. In stall the reservoir on the new master cylinder. Now you'll have to prime the new master cylinder. Put the master cylinder in a vise and put brake fluid into it. Now place your fingers over the two holes that the brake line go into. Use a large phillips screw driver and push the piston in and out about 10 times. But, do it slowly. make shore to keep your fingers over the brake line holes. . Now install it back in. Remember to bleed your brake system when your done. Hope this helps give feedback and good luck FixYa
use a flare wrench and remove the two brake lines
then remove the the two nuts that hold it to the fire wall
then remove the master cylinder reservoir because your
going to have to put it on the new one
drain out any brake fluid from it
in stall the reservoir on the new master cylinder
now you'll have to prime the new master cylinder
put the master cylinder in a vise and put brake fluid into it
now place your fingers over the two holes that the brake line go into
use a large phillips screw driver and push the piston in and out about 10 times
but do it slowly. make shore to keep your fingers over the brake line holes .
now install it back in
remember to bleed your brake system when your done
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.
master cylinder maybe or the brake lines going to the back of the truck, but most likely the master cylinder, check to see if you see any brake fluid on the front of the brake booster or any paint peeling off the brake booster