Brakes wont bleed after steel brake line replacement
Thread Starter
Junior Member
Joined: Jul 2022
Posts: 35
Likes: 14
From: Ireland
W212 E200 2.1 BlueTec 2010
Brakes wont bleed after steel brake line replacement
Hello folks,
So my rear steel brake lines were rusty and after sanding the rust off, brake fluid began leaking out. Mechanic swapped the lines but could NOT bleed the rear brakes. The front brakes bled fine. The brake pedal is soft. My front brakes work, my rear brakes do not. We agreed there is some sort of safety feature on the car which prevents all the fluid from being sent to the rear and thus leaking out, to preserve the front brakes. Some forum trawling tells me this could be a shuttle valve / combination valve restricting fluid. Another possibility is the ABS pump needs to be flushed via STAR / scan tool.
Has anyone experienced this on any mercedes model, and know how to let fluid and thus air back into the rear of the car?
All info is appreciated,
Luke
So my rear steel brake lines were rusty and after sanding the rust off, brake fluid began leaking out. Mechanic swapped the lines but could NOT bleed the rear brakes. The front brakes bled fine. The brake pedal is soft. My front brakes work, my rear brakes do not. We agreed there is some sort of safety feature on the car which prevents all the fluid from being sent to the rear and thus leaking out, to preserve the front brakes. Some forum trawling tells me this could be a shuttle valve / combination valve restricting fluid. Another possibility is the ABS pump needs to be flushed via STAR / scan tool.
Has anyone experienced this on any mercedes model, and know how to let fluid and thus air back into the rear of the car?
All info is appreciated,
Luke
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Joined: Sep 2018
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From: unbegrenzt
2017 GLE350 4MATIC
WIS does not call for ABS actuation. WIS makes no mention of a "safety feature". Mechanic needs to check his work.
Consider that there is something in the new pipes blocking the bleed procedure.
Open the system at the junction between old and new pipes and confirm you can force fluid out with pressure on the reservoir (with a bleeder device).
Then reconnect the new pipe to the old, disconnect at the caliper and check that you can force fluid through. Last is to reconnect everything, open the caliper bleed screw and repeat.
Consider that there is something in the new pipes blocking the bleed procedure.
Open the system at the junction between old and new pipes and confirm you can force fluid out with pressure on the reservoir (with a bleeder device).
Then reconnect the new pipe to the old, disconnect at the caliper and check that you can force fluid through. Last is to reconnect everything, open the caliper bleed screw and repeat.
Thread Starter
Junior Member
Joined: Jul 2022
Posts: 35
Likes: 14
From: Ireland
W212 E200 2.1 BlueTec 2010
WIS does not call for ABS actuation. WIS makes no mention of a "safety feature". Mechanic needs to check his work.
Consider that there is something in the new pipes blocking the bleed procedure.
Open the system at the junction between old and new pipes and confirm you can force fluid out with pressure on the reservoir (with a bleeder device).
Then reconnect the new pipe to the old, disconnect at the caliper and check that you can force fluid through. Last is to reconnect everything, open the caliper bleed screw and repeat.
Consider that there is something in the new pipes blocking the bleed procedure.
Open the system at the junction between old and new pipes and confirm you can force fluid out with pressure on the reservoir (with a bleeder device).
Then reconnect the new pipe to the old, disconnect at the caliper and check that you can force fluid through. Last is to reconnect everything, open the caliper bleed screw and repeat.
Thread Starter
Junior Member
Joined: Jul 2022
Posts: 35
Likes: 14
From: Ireland
W212 E200 2.1 BlueTec 2010
To clarify he did as suggested but still no bleeding from the rear. I will try to activate ABS to flush out a potential air pocket, and will also try to force a valve (if theres one there) to go back open. Both solved by slamming on brakes repeatedly.
In the meantime anyone with advice, please do post.
In the meantime anyone with advice, please do post.
Thread Starter
Junior Member
Joined: Jul 2022
Posts: 35
Likes: 14
From: Ireland
W212 E200 2.1 BlueTec 2010
To clarify he did as suggested but still no bleeding from the rear. I will try to activate ABS to flush out a potential air pocket, and will also try to force a valve (if theres one there) to go back open. Both solved by slamming on brakes repeatedly.
In the meantime anyone with advice, please do post.
In the meantime anyone with advice, please do post.
Out Of Control!!
Joined: Sep 2018
Posts: 14,668
Likes: 4,570
From: unbegrenzt
2017 GLE350 4MATIC
Thread Starter
Junior Member
Joined: Jul 2022
Posts: 35
Likes: 14
From: Ireland
W212 E200 2.1 BlueTec 2010
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MBWorld Fanatic!
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From: US
2008 E350, 2012 ML350, 2014 E350, 2015 ML350
Usually, brake fluid work should be bread and butter for dedicated mechanics; therefore, drive carefully until satisfied everything is correct, i.e. something loose, till some air in the system or else.
Enjoy your drive,
Enjoy your drive,
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Thread Starter
Junior Member
Joined: Jul 2022
Posts: 35
Likes: 14
From: Ireland
W212 E200 2.1 BlueTec 2010
Yes, but to be fair, I drove with my brake fluid too low and it must've been low enough to allow air into the ABS lines connecting to the rear. My fault.
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1983 Nissan Shltbox
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2000 CL500 1992 300SE
Now the rear brakes will not bleed and the pedal is nearly on the floor.
How exactly did you get the air out?
Thanks
Senior Member
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From: Gulf Coast
2014 Mercedes-Benz E350
You will need a pressure bleeder, pumping brake pedal does nothing. https://www.fcpeuro.com/products/pow...motive-mot0100
Member
Joined: Jan 2009
Posts: 212
Likes: 2
2000 CL500 1992 300SE
You will need a pressure bleeder, pumping brake pedal does nothing. https://www.fcpeuro.com/products/pow...motive-mot0100
