Overheating brake.

saff

MB Enthusiast
SUPPORTER
Joined
Mar 20, 2016
Messages
1,921
Location
Lancashire
Car
S211 E220 CDI Avantgarde W246 B180 CDI Sport
I'm open to suggestions here chaps.

My 2006 S211 with SBC is intermittently running a hot brake on the osr. Doesn't always do it but getting more common and usually when I've just done a motorway run. Sometimes so hot you can smell the friction material. Yesterday had the caliper replaced by my indie but on arriving home it was just the same. Parking brake seems to release fine. Indie insists pads pins etc all cleaned and greased correctly and suggests possible SBC issue. Given the money I've sunk into this car of late I'm loath to spend another grand on what may not be the solution.

Does anyone have any ideas what this might be, all suggestions gratefully received?
 

whitenemesis

MB Club Veteran
SUPPORTER
Joined
May 7, 2007
Messages
17,860
Car
Lexus RC300h F-Sport 2019
Get the codes read using STAR. I does sound like a SBC issue and STAR will be able to pinpoint the problem.
 

Bellow

MB Enthusiast
Joined
Apr 26, 2010
Messages
6,669
Location
Ecosse.
Car
C2500 350, 450
Failing/damaged (internal collapse) flexible hose can trap a brake on.
 

pmcgsmurf

MB Enthusiast
SUPPORTER
Joined
Feb 22, 2010
Messages
4,779
Location
Stirling, Scotland
Car
E55 AMG W211, E250 Sport W212, E220 Avant. W211 (and some Imps)
Had a similar thing a while ago and it did end up being the flexible hose.
Fluid was going through the hose when brake applied but then couldn't return as the hose had collapsed.

Also had the same where it was a sticky caliper (piston) too and many cases of the slider being stuck.
 
OP
OP
S

saff

MB Enthusiast
SUPPORTER
Joined
Mar 20, 2016
Messages
1,921
Location
Lancashire
Car
S211 E220 CDI Avantgarde W246 B180 CDI Sport
Thanks for the replies all. Its a brand new caliper and I'm assured the sliders etc were all free. The flexi hoses are brand new genuine MB too. Poss an SBC issue. :(
 
OP
OP
S

saff

MB Enthusiast
SUPPORTER
Joined
Mar 20, 2016
Messages
1,921
Location
Lancashire
Car
S211 E220 CDI Avantgarde W246 B180 CDI Sport
Any codes on Star?
Not sure as nothing was read. The caliper was changed with the reasonable assumption that it was the culprit. I have an Autel generic reader but I don't think it will reveal much. I may give it a try anyway.
 

pmcgsmurf

MB Enthusiast
SUPPORTER
Joined
Feb 22, 2010
Messages
4,779
Location
Stirling, Scotland
Car
E55 AMG W211, E250 Sport W212, E220 Avant. W211 (and some Imps)
Didn't they read the codes when they blead the system as this needs Star anyway?

I'd get it on Star for a check, unlikely a generic reader will know about the SBC pump so wont be able to read it.
 
OP
OP
S

saff

MB Enthusiast
SUPPORTER
Joined
Mar 20, 2016
Messages
1,921
Location
Lancashire
Car
S211 E220 CDI Avantgarde W246 B180 CDI Sport
Didn't they read the codes when they blead the system as this needs Star anyway?

I'd get it on Star for a check, unlikely a generic reader will know about the SBC pump so wont be able to read it.
Of course! They must have done to bleed the system :rolleyes:. Unsurprisingly the Autel didn't find anything amiss.
 
OP
OP
S

saff

MB Enthusiast
SUPPORTER
Joined
Mar 20, 2016
Messages
1,921
Location
Lancashire
Car
S211 E220 CDI Avantgarde W246 B180 CDI Sport
Could it be the wheel bearing?
D'you know I did consider this but absolutely no noise so not sure. Thanks for the thought.
 

Users who are viewing this thread

Top Bottom