Getting free from the post of Board of Directors is not a normal procedure. It will depend on several things. Initially, it depends on your share, and the other three directors agreeing to and finalizing your exit in a board meeting, briefing proper causes to leave and holding the rest of the liabilities on themselves. They will pass a resolution in writing, and a copy of the resolution will be sent to the Ministry of Commerce Affairs (MCA) through your Chartered Accountant, as well as other departments like Sales Tax/Service Tax (depending on where the company is registered according to the nature of the business).
If the rest of the directors are in agreement, then you may leave. For a clearer understanding, sit with your Chartered Accountant with your company's Memorandum of Association (MOA); he will provide better guidance.
Best Wishes.
Thanks,
Manish Srivastava
ISO Consultant & HR