How often should the brake fluid be changed on a 124? I have a '93 300E 2.8 with 159K that I bought a few months ago and I don't know when the brake fluid was last changed. It needs new pads which I'm going to replace myself; I thought it would be a good idea to change the fluid as well.

Also, can the system be completely flushed (along with abs) without any special equipment? All my other cars are non-MBs with Dot-3 fluid and no abs systems; I've done all brake pad and fluid changes myself. I change the brake fluid on my other cars by opening the bleed valve, having an assistant pump the pedal to drive out fluid, and keeping master cylinder topped off. I'm not yet familiar with the MB abs system or Dot-4 fluid used in these cars.

Any help would be greatly appreciated.

P.S.: I couldn't find the answers I'm looking for through the search function.