Brake light on. Codes?

[53 Jimmy]

I have a problem with my 89 K 2500, I replaced my rear brakes,drums,shoes,wheel cyl,hose and line and axel seals .. no leaks any place. my problem is that ive bled the system now my pedal is high and very sensitive right rear wheel locks setting off the abs ... it feels like the rear is working more than the front. could the abs valve be bad? if I disconnect the wire will it bypass it to see if its the problem? this problem happens 90% of the time other times it works fine. brakes are adjusted fine and no brake light on

[53 Jimmy]

Bump