there is an allen bolt on the hub behind the wheels, and two other holes with what appears to be springs to me.

Click the DIY section above and look at the e class brake job.

Alon

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'92 300CE - Sold
2004 C240 - 744 - C7 Wheels - Android Radio
2002 C320 - 816 - Sport Wagon - Sold
2006 E350 Wagon - 368 - Dead
2015 GL350 Bluetec - 197U