CLEAN the top of the MC reservoir area, completely.
1. Get "New,Fresh,cheap,plastic turkey baster[tube with a bulb on the end]"
2. Remove master cylinder reservoir cap.
3.Remove the Filter Screen insert.
4.Evacuate all the Old Nasty BF you can with the "Turkey Baster"
(you will not be able to remove fluid from the rear portion of the reservoir)
5.Refill the MC reservoir with fresh clean (UNOPENED container) BF.
6.Attach the Pressure Bleeder cap to the MC reservoir and pressurize to 15PSI.
7.Using bleeder nipples with the appropriate "Catch Container",BLEED the brakes.

There are instructions in the search function on how to make a Pressure Brake Bleeder with a $9.95 garden sprayer from your favorite Big Box Store.

All this "Pumping" or "Directing an Assistant" or using a Mighty Vac to bleed
the brakes is 19th century...This can be a quick Solo 20 minute job every Spring or ....Masochism.

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'84 300SD sold
124.128