You can thank SOA for that! Anytime the CEL is on, the cruise will not function... hence your flashing light. I would say the rattle is a sway bar bushing. As far as the brake light... the e-brake light and low fluid light are one in the same. The circuit for the fluid level is a normally open circuit, the low fluid level cause a contact ball to drop, making the circuit complete and the light is on. Try unplugging it to see if the light goes out. If it doesn't... then your issue is with the contact switch for the E-brake.