Neutral light is always on, and after replacing brake pads, brakes are staying locked up

SOURCE: I replaced the rear brake

HI FIRST OFF CLAMP THE BRAKE HOSE CLOSE TO THE MASTER CILINDER AS YOU CAN IF YOU HAVE RUBBER BRAKE LINES, YOU CANT DO THIS IF YOU HAVE BRAIDED OR SIM HOSES.
WITH THE CLAMP ON YOU SHOULD HAVE A GOOD SOLID PEDAL, IF THIS IS THE CASE,, UNDO THE BLEED NIPPLE ON THE REAR CALIPER, USE A PIPE TO CATCH THE FLUID, WHILE PUSHING DOWN ON THE PEDAL, GENTLY RELEASE THE PRESURE OF THE CLAMP, NOT ALL THE WAY THIS WILL ALOW YOU TO FORCE THE FLUID PAST THE CLAMP, BEFORE YOU ALOW THE PEDAL TO RETURN RE APPLY THE PRESURE ON THE CLAMP, REPEAT THIS SEVERAL TIMES TILL THE FLUID STARTS CUMING OUT OF THE NIPPLE, THEN TIGHTEN THE NIPPLE REMOVE THE CLAMP AND PROCEED TO BLEED IN THE NORMAL WAY TO REMOVE ANY FURTHER AIR WHICH MAY BE IN THE SYSTEM,

SOURCE: i can bleed the front

It sounds like you have an air lock in the system .
I would make sure to use the right brake fluid , drain the system and bleed the brakes again and making sure that no air is locked in the system

SOURCE: I replaced the front brake

Two ways of doing this make sure you are using the right brake fluid The bleeder on the calper open up and pull fluid with a fluid pump Get one at auto parts store dont let the master cylinder go dry OR you can fill the calaper through the bleeder and push fluid up to the master cylinder MOPOR KENNY