Can I just loose the bleeding screw & pump brake pedal, collect in a bottle & keeping adding fluid and pumping till the say 0.5 L water bottle is filled up...
Would this be an okay way of bleeding brakes ? Anybody sees any issues with this

Also, the car needs to be on (ignition key 2nd click where lights turn on) , correct ?

 

Two person job. one at the pedal, one at the bleeder valve. Make sure to keep the reservoir filled (don't want air in the lines - can upset ABS units)

It can get messy and brake fluid is nasty stuff

 

See this thread for the tools I used. Easy job.
https://mbworld.org/forums/e-class-w...blem-help.html

 

If you don't do it corrctly, it's very easy to get air into the system and it is a very, very outdated, tedious way of bleeding brakes, and it takes two people. I have a vacuum system that you attach to the bleed screw to suck out the fluid. I forgot the brand of the plastic pump about 3 feet tall, but I am sure there are other brands out there can do the same job. Try Amazon.