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OK, ABS light: Ccould be the OVP (overvoltage protection relay) or another common problem is a wheel speed sensor, the wires get open circuits especially on the front due to the wheels turning left/right. May be codes in this car or just have to do a test of the whole system, not sure on a '91.
Squeeling noises, can be fixed, lots of shops just like to say "it's a MB, what do you expect?", but this is a cop-out. Important things are to clean the slide area when replacing pads and thin film of grease where the metal backing plate of the pads contact the caliper, and I just used a thin coat of grease on the back of the plate also where the caliper piston contacts the plate. Next, VERY important to bed in the pads properly after replacement, either with new or old rotors (don't machine the rotors, reuse is fine usually just once, but don't machine them). Need to do a series of very hard stops, if you have ABS you don't want the ABS to activate, but JUST above that threshold. Do that about 5 to 10 times, maybe 30 seconds or so between brake applications so's not to get the brakes too stinkin' hot. THIS helps keep the brakes from squeeling. If you don't the pads can glaze and they never really do get bedded very well. Don't know why, it always worked for me though. If you are reusing the rotors be careful as the first few stops will be pretty lousy until the pads get the groove cut into them from the lip on the rotor. I think every car gets that lip on the edge, not just MB.
Gilly
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