the way the haynes manual describes the procedure, it looks like the dirty brake fluid gets recycled back to the reservoir? what is wrong with getting it out completely the same way i do for the brake cylinders? what am i missing here....

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$500 1982 240d owner "Gunter"
125k miles,4 speed manual
crank windows, MB Tex, all original
no a/c, daily driver
Scorecard so far....
$230 Maaco paint job
$27 dimmer switch, $40 shutoff valve, $45 brake MC, $260 calipers, $40 brake hoses, $40 side fender trim, $20 balancing, $109 lifetime alignment, $10 fuel return lines, $115 oil&fuel filters for next 30k miles