That's an issue that has to be decided by the court, the lender and the exemption status of the property.
Yes, but the court may not allow the bankruptcy to be used to release the co-signer from the financial obligation.
can a primary co signer take the car away from a secondary co signer
The co-signer would then be liable.
Nothing. The primary is all that is concerned. If signer and co-signer are, were, or will be married - that's different. If either the co-signer or the signer is or was dependent to the other,...
The primary would be held liable for the debt.