92 dodge van rear ABS-brake and ABS lights on/can't reset?

Hey Stan the man,need your vehicles info.,year,make,model and engine size and Tommy on the spot here will send you a picture diagram of your rear brake assembly.There's a special spring tool you can get at auto parts store to remove and install springs,me got one.

try bleeding your ABS block first, if that doesn not work could need a master or proportioning vavle. Some scan tools are capable of bleeding the ABS system on some vehicles, and some you have to bleed manually.

SOME SPRINTERS HAD RECALLS ON MASTER CYLINDERS YEARS 2006-2009 CHECK DEALER FOR MAYBE RECALL,IAM NOT SURE WHY YOUR BLEEDING THE BRAKES IF YOU HAD OPENED A LINE OR CHANGED A CALIPER THERE MABE AIR IN THE LINES-I ALWAYS USE A PRESSURE BLEEDER OR YOU CAN GRAVITY BLEED SYSTEM BY OPENING EACH BLEEDER SCREW UNTILL GOOD FLOW THEN CLOSEING-IF BLEEDING FOR MUSHY PEDAL CHECK BRAKES AND THICKNESS OF ROTORS-ARE THEIR ANY CODES -IS THE ABS LIGHT ON-IF ALL CHECKS OUT GO TO MASTERCYLINDER

Did you bench bleed the MC before installing it? If not, that's the problem. MUST be bench bled or you'll always have air. If brakes lights are on, the brake switch is out of adjustment OR (since you replaced the MC), the push rod is out of adjustment

Bad brake master cylinder could cause this, It will start leaking internally and not build up pressure. Will happen just do to age, will need to replace it and bleed brake system.

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try bleeding the master cylinder at the lines first as it indicates that there is still air in the pistons
loosen one line at a time and gently apply the brakes until any air bubbles come out tighten the line before releasing the brake pedal
do it for the other line and then bleed all the brakes starting at the longest line first and ending at the shortest line

first of all make sure master cylinder is full of brake fluid.then you crank car leave foot off brake pedal. watch abs light on dash it should turn off in 10 seconds if not have car towed to garage or dealer. they have to use a scanner to scan the abs brakes if abs light turn off in 3 seconds. then starting bleeding from master bleed the lower brake line fitting at the proportional valve followed by the upper brake line fitting. keep eye on brake fluid in mastercylinder dont let run dry.next prime the abs hydralic modulator.connect the bleeder hose to the rear bleeder valve on the modulator.place the other end into a container partially filled with cleab brake fluid.make sure the end of the hose is submerged.open the bleeder valve slowly about 1/2 to 3/4 turn have an assistant depress the brake pedal and hold it in the depressed position. when the flow of fluid ceases close the bleeder valve.repeat process until no air bubbles are present in the fluid.then tighten the bleed valve securely. start bleeding brakes. your bleeding sequence is right rear - left front - left rear - right front.WARNING IF ALL FAILS YOUR BRAKES DONT FEEL SOLID AND FEEL VERY SPONGY.DONT DRIVE CAR. HAVE IT TOWED TO DEALERSHIP.THEY WILL HAVE TO PRESSURE BLEED YOUR BRAKE SYSTEM.

Replace master cylinder.

sounds like maybe you didn;t bleed the brakes and there is air in the system. I would start with that