Mercedes Repair Questions? Ask a Mechanic for Answers ASAP
you will need :
an 8 or 10mm ring spanner
a brake bleed hose ( 1 with a valve in are best)
a clear vessel to catch the old fluid ( jam jars are good)
some fresh fluid
I favour having a clear hose from the nipple to a jar 1/2 full of old fluid and with the nipple closed your assistant pushes the pedal up and down a few times then holds it down then you crack open the nipple and close it again whilst fluid is still flowing.
this video should prove helpful
Repeat this a few times on all calipers and start with the caliper furthest away from the master cylinder.
a pressure / vacuum pump is a nice to have but not a requirement if you have a helpful assistant to push the brake pedal
and there's no need to have the engine running to bleed , even with ABS
what is important to say is that if you have replaced any part of the brakes before the ABS then you will have air trapped in the ABS pump that can only be removed by getting the ABS pump to run
I normally achieve this by driving the car a short distance and hitting the brakes very hard so the ABS triggers and runs the pump / actuator then bleed the brakes at the wheels again