Brake pressure sensor assistance please

[walkergetx]

I am trying to locate a new master cylinder pressure sensor for my 1976 450SL. I found the part number 004 542 30 17, but no one seems to have it. ATE seems to be where most got it from, and it is discontinued. I found one place where the ATE # is 03.3525-9108.2. I have seen a cross reference to a Porsche 911 part number, but can't seem to confirm it is the correct one. can anyone give me the correct Porsche # and confirm it is the same as the Mercedes part?

Thanks.

[Frank Reiner]

Do you have an electrical schematic for the circuit, and/or can you describe the function of the switch in question?
The online drawings and descriptions are confusing and contradictory.
Yes, there is a Porsche # online; it is 911 606 401 00 (yoyo).

[walkergetx]

No schematic. It is supposed to measure pressure in the master cylinder and turns on a red idiot light on the dash. I saw that on yoyo but can't seem to confirm it anywhere else. There is availability on the Porsche part, but not on the mercedes, for some strange reason.

[97 SL320]

In all practicality, the light isn't needed. If brake pressure becomes unbalanced due to a leak, you will feel the pedal drop. I haven't come across a car ( regardless of make ) where the light was on and pressures OK unless there was a leak, it was fixed and ,on some cars, the switch reset.

[Frank Reiner]

My view is essentially that of 320's. Mid 1976 that light was deleted; if the switch is mechanically intact and not leaking, it may be unplugged and/or the bulb removed from the light. If the switch is leaking, it may be removed and the port plugged.