Drove the '85 300 td to town last night and the brake pedal went soft and about 1/2 way down a couple of times, lasting a minute or two, then became firm again. Not at that exact time, but intermittently throught the drive the yellow light on the dash next to the brake warning light came on. I has a round circle with dotted lines around the perimeter. On the way home ,12 miles it never came back on. Are the two related? I don't see a traditional vacuum pump anywhere... Where is it? Also, last but not least, what repair manual do I want to buy? All I have is the owners manual in German. Thanks

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'85 300 TD wagon. Euro spec. 215,000 miles, real beater (for now). '59 f350 with cummins 6at, 54 gmc flatbed with cummins 6at, '92 f350 service truck with 7.3 NA IDI and 5 spd man tran, Grumman Aluminum stepvan with 6.2 (cabinet hauler) I like diesels.....