I would jack up the front & examine. If the pads on 1 caliper are worn, change them while you have the calipers off. If the rotor is warped by the heat, replace or turn. Minimum thickness is stamped into the edge of the rotor. MBZ rotors are beefy enough at least on my SD to turn once. If hose(s) are cracked or otherwise suspect, replace both (all). Deciding on the caliper may take thought. Reman are way less expensive and some brands are problematic. Then there is the question of changing 1 or both. I'd probably do both if 1 caliper is bad & be finished with that end of the car. Putting new seals in used to be standard procedure. You want to repair enough so that the entire system is in good shape else you'll be working on the next weak link that you didn't take care of now.
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85SD 240K & stopped counting painted, putting bac together. 84SD 180,000. sold to a neighbor and member here but I forget his handle. The 84 is much improved from when I had it. 85TD beginning to repair to DD status. Lots of stuff to do.
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