Bled my brakes - A few questionss now
Thread Starter
Super Member
Joined: Aug 2008
Posts: 528
Likes: 20
From: Chicago IL
X166 gls450 2017
Bled my brakes - A few questionss now
ok so it was easy on 3 wheels but front passenger side took in air .. I did it the conventional way. Had a one-man bleeding kit from Autozone. And I pumped the brake & kept filling the brake fluid (MB brake fluid dot4). Here are some questions now:
1- when I pumped the brake, only a certain amount of fluid is forced out - not everything in the master cylinder (like I thought). Probably its the amount of fluid in that line. Is this true ?
2- The SBC buzz became little fast paced (bzzzzz) verses before bleeding (bz zz z z z) so I assume the clean fluid kicked in a bit - But sometimes the Buzz is very long, never before did I ever get long buzzes .... Is this because there's still some air trapped on the passenger side front ?
pls advise, I'm freakin out
1- when I pumped the brake, only a certain amount of fluid is forced out - not everything in the master cylinder (like I thought). Probably its the amount of fluid in that line. Is this true ?
2- The SBC buzz became little fast paced (bzzzzz) verses before bleeding (bz zz z z z) so I assume the clean fluid kicked in a bit - But sometimes the Buzz is very long, never before did I ever get long buzzes .... Is this because there's still some air trapped on the passenger side front ?
pls advise, I'm freakin out
Super Member
Joined: Apr 2005
Posts: 666
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From: Boston, MA USA
03 E320 -wife's car now; 07 Porsche Boxster S - my toy
Regards,
paul...
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Joined: Mar 2006
Posts: 3,254
Likes: 15
From: Louisiana
03 E500 and Corvette
Paul I read somewhere the motive doesn't have enough pressure to bleed/flush the sbc system. I was getting ready to buy one to do all my vehicles. How did it work out for you? vettdvr
Super Member
Joined: Apr 2005
Posts: 666
Likes: 4
From: Boston, MA USA
03 E320 -wife's car now; 07 Porsche Boxster S - my toy
Can't bleed the SBC because the Star Diags tool is needed to exercise the valves inside it -- all we can do is perform a conventional bleed on the rest of the lines/calipers. I've performed this twice on the E320 and also on my Boxster (which has an ABS that requires the factory scan tool) to bleed but provides instructions to bleed the rest of the system since they only say to bleed the ABS pump if it's been replaced/fixed) and haven't any issues with the brakes. I saw a tool to work the SBC for brake fluid flushes that was made in Taiwan but they wanted about $500US for the tool. I just unplug the SBC and do the bleed, then reconnect the SBC and drive away.
I think the SBC needs about ~3 bar of pressure (~45 psi) and you're right -- the Motive unit doesn't go that high. Drivbiwire on the other forum did a nice write-up about bleeding the brakes with the Motive unit and not bothering with the SBC.
Considering that the brake fluid required is DOT 4+, changing it every 2 yrs like the service info dictates should keep it OK -- the fluid in the SBC will probably mix with the new fluid, so you will get it next time.
Regards,
paul...
Thread Starter
Super Member
Joined: Aug 2008
Posts: 528
Likes: 20
From: Chicago IL
X166 gls450 2017
Guys, I think I have a problem with SBC unit ever since I bled the brakes..
Remember when you unlock the car we always hear the SBC buzz ... Well now my car doesn;t do that - I do hear two clicks from the SBC unit (I observed with the hood open) and it appears as if it tried but couldn't buzz ... Now when the engine is running its fine - I hear the buzzes and brakes work normal ... Do I need to take it in for a check ? .. Are these early warnings for sbc failure ? Any info is greatly appreciated
Remember when you unlock the car we always hear the SBC buzz ... Well now my car doesn;t do that - I do hear two clicks from the SBC unit (I observed with the hood open) and it appears as if it tried but couldn't buzz ... Now when the engine is running its fine - I hear the buzzes and brakes work normal ... Do I need to take it in for a check ? .. Are these early warnings for sbc failure ? Any info is greatly appreciated
MBWorld Fanatic!
Joined: Mar 2006
Posts: 3,254
Likes: 15
From: Louisiana
03 E500 and Corvette
Guys, I think I have a problem with SBC unit ever since I bled the brakes..
Remember when you unlock the car we always hear the SBC buzz ... Well now my car doesn;t do that - I do hear two clicks from the SBC unit (I observed with the hood open) and it appears as if it tried but couldn't buzz ... Now when the engine is running its fine - I hear the buzzes and brakes work normal ... Do I need to take it in for a check ? .. Are these early warnings for sbc failure ? Any info is greatly appreciated
Remember when you unlock the car we always hear the SBC buzz ... Well now my car doesn;t do that - I do hear two clicks from the SBC unit (I observed with the hood open) and it appears as if it tried but couldn't buzz ... Now when the engine is running its fine - I hear the buzzes and brakes work normal ... Do I need to take it in for a check ? .. Are these early warnings for sbc failure ? Any info is greatly appreciated
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Joined: Jun 2009
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2005 E500
My E500 does not "buzz" every time I unlock the door. Sometimes it buzzes, and sometimes it doesn't. I do regularly hear it while I am driving. If the brakes are working well, then all is probably OK.
Once, while bleeding the brakes, I ran the brake fluid reservoir dry, and this did make the SBC unit sound very different. It would run for a longer than usual time, and finally give me the red brake warnings. I then ordered the Motive Power Bleeder, and rebled the system. All was well after that.
Once, while bleeding the brakes, I ran the brake fluid reservoir dry, and this did make the SBC unit sound very different. It would run for a longer than usual time, and finally give me the red brake warnings. I then ordered the Motive Power Bleeder, and rebled the system. All was well after that.
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Thread Starter
Super Member
Joined: Aug 2008
Posts: 528
Likes: 20
From: Chicago IL
X166 gls450 2017
My E500 does not "buzz" every time I unlock the door. Sometimes it buzzes, and sometimes it doesn't. I do regularly hear it while I am driving. If the brakes are working well, then all is probably OK.
Once, while bleeding the brakes, I ran the brake fluid reservoir dry, and this did make the SBC unit sound very different. It would run for a longer than usual time, and finally give me the red brake warnings. I then ordered the Motive Power Bleeder, and rebled the system. All was well after that.
Once, while bleeding the brakes, I ran the brake fluid reservoir dry, and this did make the SBC unit sound very different. It would run for a longer than usual time, and finally give me the red brake warnings. I then ordered the Motive Power Bleeder, and rebled the system. All was well after that.
