brake fluid exchange
 

I have now attempted to do the brake fluid change on both the "E" and "S" this past weekend, but am left with a question. I was successful in replacing the fluid in the brake reservoir and bleeding from the wheel calipers, but I cannot for the life of me see where the fluid drains from the antilock break controller (ABS). On both of the beasts, the ABS controller does not look anywhere close to the picture described in my copy of the "Mercedez-Benz E-class Owner's Bible".

Does this system automatically bleed the ABS system and reservoir when doing a conventional brake bleed?

Ron

bump!
 

i'd also like to know how to clear the fluid in a w140

I'm not aware that the ABS unit has a bleed valve.
I start by siphoning out all the fluid from the front reservoir. What appears to be a single reservoir is actually two via internal baffling. The rear reservoir is difficult to access as it's fill port is just inboard of the bottom of the fill cap. I usually bleed the rears until the fluid is just below the low mark as viewed from the inside face of the reservoir. Then completely fill the reservoir, and tilt it to the inboard side to get the rear res. to fill when the front res. is full.

Then I flush about a quart of DOT 4 fluid through the system using a helper to pump the brake pedal while I operate the bleed valves.

If you have a manual transmission, don't forget to bleed the clutch. The clutch supply line is near the bottom of the front brake res. The clutch does not have a separate res.

Duke