I will buy the mercedes brand coolant and brake fluid and probably the pads for the front discs since I suspect they need replacing (might as well do it all at one right?).
There are sensors that indicate when the brake pads are worn. I believe that a message appears on the dash. Mercedes recommends replacing the sensors when replacing the brake pads (they are cheap to replace).
1998 Mercedes E320, 200K Miles
2001 Acura 3.2TL, 178K Miles
1992 Chevy Astro, 205K Miles