Sensotronic Brakes WTF? Bled brakes
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Joined: Aug 2015
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From: DC Metro Area
2007 Mercedes E550
Sensotronic Brakes WTF? Bled brakes
Hi All,
I really do love my W219 CLS, but I really do now understand why some say these cars are over-engineered.
First, Airmatic Suspensions is its own devil which I won't even get into. I have bothered you all enough with my rants on Airmatic.
Now, this weekend I bled my brakes with a Mityvac pump. Aside from possibly getting a little air in the system (was just getting through a learning curve with Mityvac Pump), everything went fine.
Sucked a lot of old dark/old fluid out and put back Mercedes amber dot 4 fluid. I couldn't find the blue fluid. Apparently, the blue fluid is illegal. Smh...
Then later I stumbled onto a web page that talked about Sensotronic Brakes. Electric brakes? Second battery? No Brake Booster? STAR controlled? Wha- What??
All of this is news to me, but glad I know I need to check the secondary battery. Just by blind luck, I had the SBC system was switched off while I did the work (I think)...
Today on my drive to work the brakes felt great. Perhaps it was just in my head, but the braking was a bit firmer. There was a slight squeal at first, but that went away, and I believe that is due to the air that may have got in the lines. I will redo and get the air out.
Apparently, it is fine that I did the manual brake bleed. I didn't get any warning lights and my drive to work was great.
Here is one post that indicated the manual method with the pump is fine:
http://www.benzworld.org/forums/w211...an-done-w.html
Anyone have any suggestions or comments? Thanks in advance -Lex
I really do love my W219 CLS, but I really do now understand why some say these cars are over-engineered.
First, Airmatic Suspensions is its own devil which I won't even get into. I have bothered you all enough with my rants on Airmatic.
Now, this weekend I bled my brakes with a Mityvac pump. Aside from possibly getting a little air in the system (was just getting through a learning curve with Mityvac Pump), everything went fine.
Sucked a lot of old dark/old fluid out and put back Mercedes amber dot 4 fluid. I couldn't find the blue fluid. Apparently, the blue fluid is illegal. Smh...
Then later I stumbled onto a web page that talked about Sensotronic Brakes. Electric brakes? Second battery? No Brake Booster? STAR controlled? Wha- What??
All of this is news to me, but glad I know I need to check the secondary battery. Just by blind luck, I had the SBC system was switched off while I did the work (I think)...
Today on my drive to work the brakes felt great. Perhaps it was just in my head, but the braking was a bit firmer. There was a slight squeal at first, but that went away, and I believe that is due to the air that may have got in the lines. I will redo and get the air out.
Apparently, it is fine that I did the manual brake bleed. I didn't get any warning lights and my drive to work was great.
Here is one post that indicated the manual method with the pump is fine:
http://www.benzworld.org/forums/w211...an-done-w.html
Anyone have any suggestions or comments? Thanks in advance -Lex
Last edited by LexBrett2; Aug 14, 2017 at 02:45 PM.
