The slow sinking pedal sounds more like a master cylinder (MC) problem than
air in the lines.  On an old MC the area routinely "swept" by the piston
stays smooth but the untouched part of the cylinder can get rough enough to
chew up the piston seal.  So if the pedal gets pushed beyond the normal
range it can wreck the piston seal.  I'd rule out other problems first but
you may have a sick MC.

Scott

-----Original Message-----
From: Mercedes [mailto:mercedes-boun...@okiebenz.com] On Behalf Of Rich
Thomas
Sent: Sunday, July 14, 2013 7:23 PM
To: Mercedes Discussion List
Subject: [MBZ] Brake bleeding

I got the new front brake rotors and calipers/pads on the 84 SD, spent 
like an hour bleeding the system, putting in new DOT4 fluid. Went around 
3 times sucking fluid with the MityVac, was getting a tiny bit of air 
but it seemed mostly to be leaking around the bleeder threads (I did 
wrap them all with some teflon tape to try to seal better) or my bleeder 
hose (which seems to fit fairly tightly).  I was not getting much air on 
the final bleed.  The pedal seemed pretty hard, but when I went out to 
bed in the pads, the pedal was getting a little soft and going down 
slowly as I held it, so it appears there is still some air in there.

Question:  how do I get that last bit of air out?  I have been 
successful on the other SD and the TD but this thing seems to be 
intransigent.  Should I go around again and suck out more fluid?  Or 
should I make a pressure cap to do a pressure bleed?

Ideas welcomed, I don't want to loose my break petal!

--R


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