Ethan,

With the engine off, the pedal firms up after 2-3 pumps,. Pumping the pedal with the engine running, firms up the pedal just little bit.

The shop uses pressure bleeder to bleed the car.

Fluid level in the reservoir is between the min and max marks and the screen and cap are properly fitted on the reservoir.

The shop (MB dealer) used OEM / Mercedes pads and discs.

It is quite difficult to regulate the brakes when trying to slow down because the braking action is either full force or none.

Willy