There should be a bleeder somewhere on the upper side of the rear calipers (unless the previous 'mechanic' twisted them off!).
The front brake hoses were about $22 each from a local foreign parts store for my neighbors' 1972 220 - not out of line, compared to what brake hoses cost for many late model US cars. Both of his front brake hoses were completely plugged after 30 years!

Happy Motoring, Mark

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DrDKW