Okay, I feel like the biggest bonehead on the planet. I've changed the brakes a couple times on my 04 E320 already. What I remembered reading was that it was a big ass no no to open the door while the SBC was disconnected.
zp. Interesting situation. I assume you meant connected
As I do not have SBC on my CLK I have no personal experience here. However I was interested enough to look up the SBC operation in my WIS. On every page that refers to working on the SBC brakes system, the instructions are prefaced by the instruction to disable the SBC using SDS.
It then goes on to list the items that can trigger the SBC operation which makes interesting reading. ie.
"The SBS system builds up high pressure and pushes the brake cylinder out automatically when:
The vehicle is opened by remote control.
The driver, front passenger, or rear door is opened.
The trunk is opened.
The key is turned to position 1 in the ignition switch.
The brake pedal is operated.
The parking brake is released.
The system performs a 'self-test' - (pre-drive test)"
It occurs to me that it is would be difficult to work on the brakes with the parking brake on.
Also, as the pressure is held in a pressure reservoir attached to SBC control unit (A7/3n1) I imagine that disabling the SBC does not remove the pressure - it inhibits the control.
So my question to anyone who knows the SBC system well is - why not disconnect the connector on the SBC hyudralic unit (A7/3)?
Would that do the same as using SDS to prevent inadvertant SBC operation?