In addition to the excellent points made by Paul, the initial break-in period is extremely important for long, quiet life of MB pads. The recommended procedure is is to make 5-10 easy stops from about 30 mph, but letting the pads and rotors cool off between stops. A lot of people neglect this step and are left with pads with little hard, burned high spots which can be noisy.

Some say you may be able to counteract this with a number of hard stops to break up any glazing on the pads.

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Steve
'93 400E