if you replace all 4 calipers and in the process let the MC go dry do you have to bleed the MC too?

reason being is im using a vacuum pump and ive been bleeding the rear caliper forever and fluid still has a lot of bubbles with it coming threw the tube to the pumps resivuor.

 

if you drain the MC you'll have to bench bleed it, or you'll never get the bubbles out.

 

well i didnt remove the MC. i took off all the calipers then pumped the pedal to get all the old fluid out. do i still need to do that?

 

I'm replacing my MC with a rebuild, is the bench bleeding process covered in the Haynes manual? I'll be buying a pressure bleeder kit to make the system bleeding much easier.
Could you explain it in more detail or point us in the right direction to find how this is done.

Never mind I did a search on Bench Bleeding onthis forum and found the explanation. Also an excellent thread on how to build your own pressure bleeder.