I hope you mean brake hoses (the rubber hose). This misnomer tripped a discussion a few weeks back.

Replacing brake hoses should be the first order of business. Ideally, you should replace the brake hose, then bleed/flush the fluid from that line for one wheel before moving on to the next wheel.

I'm not exactly sure about your vintage of vehicle, but DOT 4 is specified by Mercedes. I believe the dealer sells a DOT 4+.

Definitely make sure the master cylinder never runs dry during bleeding. If it does, you may have to bleed the master cylinder before continuing your brake job.

__________________
95 E320 Cabriolet, 169K