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E300 Eating break fluid... Slowly

Discussion in 'Suspension, Steering & Brakes' started by Mickey76, Dec 29, 2012.

  1. Mickey76

    Mickey76 Senior Member

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    Joined:
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    Location:
    North Yorkshire
    Your Mercedes:
    2003 E320 Cdi S210 145k
    Hi, this one sounds expensive!
    I started getting the dreaded ABS, BAS and ASR lights back on about a month ago when I drove for about a mile but only if I go above about 50mph, abs kicks in at low speeds until lights come on. THEN... BAS light started staying on when restarting car, got 1mile, reached 50mph ABS and ASR comes on. NOW... Early december low brake fluid warning comes on, fluid on min level. Topped up to max.done this 3times to date. Approx 400ml?
    Brakes feel normal, no marks on drive of fluid loss. Had car sat a week and no fluid loss, loses only when driving and only very small amount. Fluid looks clean. Nothing obvious underneath car. Could it be BAS unit ,internal leak?
    Thanks in advance
     
  2. Doug1234

    Doug1234 Senior Member

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    Location:
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    Your Mercedes:
    1997 w210 e300td
    Have a look under the dash ,run your fingers along the brake pedal up towards the servo rod mechanism and feel for brake fluid on the metalwork and also on any sound proofing it would have dripped onto if it is as I suspect escaping out the rear of the servo.
     
  3. OP
    Mickey76

    Mickey76 Senior Member

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    Your Mercedes:
    2003 E320 Cdi S210 145k
    Had quick look but all dry where I could get to. Will take panels off in daylight to check properly tomorrow. Is that why the car has started steaming up on a morning?
     
  4. television

    television Always remembered RIP

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    Your Mercedes:
    2002 SL500, 216 CL500, all fully loaded
    It can go into the brake servo when leaking
     
  5. OP
    Mickey76

    Mickey76 Senior Member

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    Your Mercedes:
    2003 E320 Cdi S210 145k
    Taken panels off and checked under master cylinder/servo, no leak visible. Is there any way to check for internal servo leak? Will get car on ramps and check everything thoroughly underneath tomorrow hopefully.
    Anyone got any ideas what the BAS light has to do with this?
     
  6. television

    television Always remembered RIP

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    Your Mercedes:
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    There are BAS travel and pressure sensor in the servo so this could be the problem if no external leaks found.
     
  7. OP
    Mickey76

    Mickey76 Senior Member

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    2003 E320 Cdi S210 145k
    Had a check today, everything is wet so a little difficult. Suppose the only way to see if its servo is to keep topping up fluid and see if any fluid comes out anywhere?? The e class of this era certainly isn't mercedes' proudest moment!!:neutral:
     
  8. television

    television Always remembered RIP

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    Your Mercedes:
    2002 SL500, 216 CL500, all fully loaded
    The servo tank is air tight,,,perhaps you can disconnect the vacuum hose and see if it is wet
     
  9. OP
    Mickey76

    Mickey76 Senior Member

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    Am I ok to just pull the vacuum hose out?
    Thanks
     
  10. television

    television Always remembered RIP

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    Your Mercedes:
    2002 SL500, 216 CL500, all fully loaded
    I am not sure how it is fitted, if no clamps it should pull off

    [​IMG]
     
  11. OP
    Mickey76

    Mickey76 Senior Member

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    Super, ta, was just checking as pulling stuff on this usually turns out bad!
    Wish the rain would give me a break though!:lol:
     
  12. television

    television Always remembered RIP

    Messages:
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    Your Mercedes:
    2002 SL500, 216 CL500, all fully loaded
    I will check for sure on this,, the rain, dont tell me about it,,,front caliper seized on the V70R :(
     
  13. OP
    Mickey76

    Mickey76 Senior Member

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    Good old brute force fix? They're the kind I like! No electrics involved;)
     

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