Abs and brake lights both stay on

The ABS system utilizes Sensors at the wheels, some form of modulator (the can release each wheel's brake individually) and a control module (could be part of the car's ECU).
If you're just replacing parts randomly, you will drop a lot of money and time and probably won't cure the actual issue.
Anti lock braking system
How Anti Lock Brakes Work HowStuffWorks

gmc envoy i had done the same wound up replacing all four wheel brake pads and light stayed off

although the ABS uses the brake system it functions independently and is comprised of mostly electrical components. Worn brake pads will not effect the abs systems function.

What you need to do is have the ABS system scanned for codes. This will give you a much clearer idea of the direction to go in order to solve the problem. Since the light comes on and stay on after you start the vehicle the ABS system has a failure in its self check. Common causes of this are bad wheel speed sensors but there are numerous other possibilities.

If you have an ohm meter you can check the resistance of all the wheel speed sensors. if one is not simular to the others than that would be a good place to start.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

I replaced the hub bearing assembly on drivers side twice and the light stayed on and the brakes worked fine. It was the wires (visible just above the tire on the frame) that rubbed against the frame that had shorted out. It was simply repaired and clip-stripped up out of the way. The light has been off every since then.

you must re-bleed the system properly, especially the back brakes. Bring your vehicle to a local autozone to reset the ABS light or check for an ABS fault code and post it on fixya!!

To install:

1. Install or connect the following:
   
   • Brake pads to the caliper mounting
     
   • Pin boots, sleeve boots and brake pads. Tighten the slide pins to 25 ft. lbs. (34 Nm).
     
   • Wheels
     

Did you tighten to only 25 ft.lbs.? It's not a lot so I hope you didn't smoke it down!

probbably a sensor is deffective or a snapped wire on the front where it moves about with the steering.
Have a nice day.

These definitely sound related. Need to inspect to see if it's something loose (like a wheel sensor) or the brake pads need replacing, etc. etc...

Charlie

Check to see if your brake pads and rotors are in good condition. Or if you have replaced the pads yourself and have not reset the wheel sensors this would cause the ABS Antilock Brake System light and the ASC Automatic Stability Control light to stay on as the ASC uses the ABS brakes with computer assistance to control the car

Check to see if your brake pads and rotors are in good condition. Or if you have replaced the pads yourself and have not reset the wheel sensors this would cause the ABS Antilock Brake System light and the ASC Automatic Stability Control light to stay on as the ASC uses the ABS brakes with computer assistance to control the car