1250 Bandit back brake issues

Well one of those weeks folks, my 2011 Bandit 1250’s back brake won’t move!
Started with what I thought was a simple issue on the back brakes, and I stripped off calliper to find it was not the calliper that had locked up but something else in the system.
I’m suspecting it’s the ABS unit that’s caused the back brake to not move when stepped on.
Ok, any Advice is  welcome.
I’ve heard it could the ABS unit that’s failed, or an air lock in the ABS lines.
Can anyone give me some way to fault find my way through this issue.
Secondly can anyone in Perth recommend someone to rebuild the calliper for me as I just don’t have the time.
I’m also going to drop off my front forks which has a seal gone at JMS for a rebuild

Having been told most good shops are booked up weeks in advance I’m going to do my own front forks now.
Who has Race Tech springs and is a heavy arsed bugger like me ( 96kg)
And what springs did you put in?
Cheers
Tony

ABS , arrhh,
Pull fuse & check electrical connection for the sensor on the rear, clean while there.  
With fuse pulled, system should revert to normal ?(guess)
otherwise you'd have no brakes when fuse blew  
Other than that I'm out of guesses, let us know how it worked out, cheers

PS 96 kg is middle weight

I’ve taken the battery out now and still no movement on the back brake leaver.
Next I will strip off the master cylinder and check it

Yep i had the same issue took it to Suzuki dealer they told me ABS modul was not working wanted $2200 so as the unit is split in 2 one for front and one for back i just cut to brake hose from the ABS unit got another hose made from master cylinder to calliper and bang $120 later all fixed 

yea ha

Yep got a 105Kg`s here and just did my front forks with race tech springs not real hard you will have to cut the spacers though mine were 130mm long (they come in the box with a length)and they are great no more moooshy mooshy at the start ,Can`t remember the size just look up the chart and all will be good