The bank cannot do anything to your brother at all. Somebody else cannot be blamed for the acts of a person. Also, your bank will not call your current employer. I am almost sure of this as this matter is just between you and the bank and your company comes nowhere in between.
Keep in mind, the bank is now in the receiving end and stands in a weaker position. They just want their money back, that's all. The fact you are willing to return their money is enough for them. So you can stand your ground and negotiate with them as per your requirements on how you will be returning the loan. Make it as easy as possible for you keeping in mind your needs. The bank will accept YOUR terms of payment but you need to stand strong.
Lastly, I had advised you in my earlier email to overlook any comment from Molten Metal. Keep this in mind and do not follow or accept what this person posts.