Your ROs should specify parts and prices. Are they Mercedes part numbers? Ask them the source of the parts - new MBZ parts via the MBZ parts distribution system or what?
Always ask for the old parts back.
Look for signs of leakage from the master (under the dash) and slave (bottom of the bell housing. Brake fluid is water soluble and has a bitter taste. Any leakage of fluid means air could be getting in, but the problem could also be caused by an "internal leak", which will not leave external fluid evidence.
Duke
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