That's reassuring. I'm going to flush my 91 300E and my Volvo S80.

According to alldata.com the procedure for the Volvo calls for between 29 and 40 psi when using a bleeding unit. It also says to start with the left front caliper (closest). That also goes against the way I was taught, but I figured it must be a ABS thing.
In the Bentley manual (E-class Bible) it recommends that:
"Caution - On vehicles equipped with ASR, do not attempt to change the brake fluid without using a pressure bleeder capable of maintaining a pressure of 2 bar (30 psi). The fluid and bubbles cannot be effectively evacuated from the system without a pressure bleeder with 2 bar capacity."

Fortunately, my Benz doesn't have ASR.