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Brake Service Light

Discussion in 'Electrics, Vacuum, Ignition and ECU' started by AbeM, Oct 26, 2012.

  1. AbeM

    AbeM Senior Member

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    Joined:
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    Location:
    Edinburgh
    Your Mercedes:
    E320 CDI Sport Estate
    Hi looking for advice and members experience. I am randomly getting the brake service light (return to workshop) coming on. It puts the fear of god in me as my car has the SBC braking system. I had it checked out at the last service and nothing came up on diagnostics and brakes given the okay.

    I have noticed that when it's dry nothing comes up. Lots of rain means it will come on. Any ideas what to look at, it sounds electrical but not sure where the sesors live and how easy to replace.

    I'd really appreciate any experiences of similar or places to look.:confused:
     
  2. orb the Impaler

    orb the Impaler Senior Member

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    Your Mercedes:
    2012 SLK 250 CDi AMG | Volvo V70 2.5T AWD | MV Agusta F4 | 1999 YZF-R1
    I suspect you have actually got a SAM failure; I had these exact symptons on my R230 SL500 - worse when wet, although it deteriorated over time.
     
  3. OP
    AbeM

    AbeM Senior Member

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    Your Mercedes:
    E320 CDI Sport Estate
    Thanks for the quick reply. If this is the route of the problem are there further symptoms I should look out for?

    I am almost scared to ask the next question. How much does a SAM unit cost and where is the best place to source it? Mine is a S211 E320 CDI 55 Plate.

    Also is it something I could do myself or best left for a specialist?
     
  4. EmilysDad

    EmilysDad Senior Member

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    Your Mercedes:
    ML350
    Not a DIY job unless you have a Star :( No idea about cost, but a SAM for a Smart Roadster is around £450
     
  5. television

    television Always remembered RIP

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    Location:
    Daventry
    Your Mercedes:
    2002 SL500, 216 CL500, all fully loaded
    Certainly take a look on the connectors to the SAM and spray if necessary with a non drying switch cleaner, if it is fine in the dry then some good damp fault

    Check for any green algae on the pins
     
  6. OP
    AbeM

    AbeM Senior Member

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    Sorry for my ignorance, but could you advise where the SAM is located? I have read some posts where they talk about front and rear SAMs. Would WD40 be a non drying switch cleaner?
     
  7. television

    television Always remembered RIP

    Messages:
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    Your Mercedes:
    2002 SL500, 216 CL500, all fully loaded
    It is 30 in the picture, there are many numbers for them, I do not like WD40 much but it will do the job
    30 A 003 545 59 01 CENTRAL ELECTRICAL SYSTEM
    SIGNAL ACQUISITION + ACTUATION MODULE WITH FRONT FUSE AND RELAY MODULE
    SAM/SRB N10/1
    Replaced_By: A 211 545 30 01 001
    30 A 211 545 30 01 CENTRAL ELECTRICAL SYSTEM
    SIGNAL ACQUISITION + ACTUATION MODULE WITH FRONT FUSE AND RELAY MODULE
    SAM/SRB N10/1
    Replaced_By: A 211 545 29 01 001
    30 A 211 545 29 01 CENTRAL ELECTRICAL SYSTEM
    SIGNAL ACQUISITION + ACTUATION MODULE WITH FRONT FUSE AND RELAY MODULE
    SAM/SRB N10/1
    Replaced_By: A 211 545 40 01 001
    22 N 910112 2006003 NUT
    MOUNTING, EQUIPMENT BOX
    M6 [042], [057]
    004
    30 A 211 545 40 01 CENTRAL ELECTRICAL SYSTEM
    SIGNAL ACQUISITION + ACTUATION MODULE WITH FRONT FUSE AND RELAY MODULE
    SAM/SRB N10/1
    Replaced_By: A 211 545 44 01 001
    30 A 211 545 44 01 CENTRAL ELECTRICAL SYSTEM
    SIGNAL ACQUISITION + ACTUATION MODULE WITH FRONT FUSE AND RELAY MODULE
    SAM/SRB N10/1
    Replaced_By: A 211 545 72 01 001
    30 A 211 545 72 01 CENTRAL ELECTRICAL SYSTEM
    SIGNAL ACQUISITION + ACTUATION MODULE WITH FRONT FUSE AND RELAY MODULE
    SAM/SRB N10/1
    Replaced_By: A 211 545 63 01 001
    30 A 211 545 63 01 CENTRAL ELECTRICAL SYSTEM
    SIGNAL ACQUISITION + ACTUATION MODULE WITH FRONT FUSE AND RELAY MODULE
    SAM/SRB N10/1 [102], [103]
    001
    30 A 211 545 78 01

    [​IMG]
     

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