I have just replaced the Rear Disc Pads and the Front Pads and Discs.
After putting it all back together, I appear to have a problem with the ABS.
I get either of 2 situations: The ABS light flashes but the brakes work perfectly or the light stays out but the ABS cuts in whenever the brakes are used.
Does anyone have any ideas on what may be causing this (There was no problem with the ABS until I changed the items above.)

Any help would be appreciated.

 

without knowing the exact year of the car, we can give you general answers

first are you sure you hooked everything back up properly, and while changing these items did you by chance bust something inadvertently? next thing is one of your abs sensors might have decided to take a **** or be getting ready to take a **** right about the time you changed the other stuff or your module might be taking a ****