The FMCSA may, at any time, refuse to accept or may revoke its acceptance of any surety bond, certificate of insurance, qualifications as a self-insurer, or other securities or agreements if, in its judgment such security does not comply with these sections or for any reason fails to provide satisfactory or adequate protection for the public. Revocation of acceptance of any certificate of insurance, surety bond or other security shall not relieve the motor carrier from compliance with § 387.301(c).