Just put new rotors, rebuilt calipers, pads, sensors and hoses on the '88 420SEL.

Suggest you try ******** as they often have great prices on premium RAYBESTOS rotors (as in $37 each) & rebuilt calipers, both loaded or unloaded (mine were A-1 Cardone @ $57 each, I already had a set of pads)...

Just like new! Mercedes brakes from this era are wonderful, IMHO. Great braking "feel" & control.

Cheers!

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'91 420 SEL @ 199K, '92 SVX @ 181K, '93 SC400 @ 86K, '93 Kaw ZX-11 @ 30K, '87 F250 @ 181K , 2001 Valkyrie Interstate @ 6K, Y2K Honda NightHawk 250 with 1.5K, '88 420SEL I.@ 179K & the 2nd latest, an '88 420SEL II.@ 210K runnin' parts car, '85 F150 300/NP435